MCQ Questions for Class 12 Medical Chemistry Organic Compounds Containing Nitrogen Quiz 14

Correct order of basic strength of this compound is:

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$IV> II> III> I$
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$III> II> I> IV$
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$III> I> II> IV$
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$I> IV> III> II$

which one of the following will be most basic?

Which is the strongest base?

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Methanamine
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Ethanamine
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Propan-2-amine
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Phenyl methanamine

Arrange the following molecules in the descending order of basicity :

$\eqalign{ & {\text{I)}}{C_6}{H_5}N{H_2}\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;{\text{II}}){\text{m}} - {\text{N}}{{\text{O}}_{\text{2}}}{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{4}}}{\text{N}}{{\text{H}}_{\text{2}}} \cr & {\text{III)p}} - {\text{N}}{{\text{O}}_{\text{2}}}{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{4}}}{\text{N}}{{\text{H}}_{\text{2}}}\;\;\;\;\;{\text{IV)}}\;{\text{o}} - {\text{N}}{{\text{O}}_{\text{2}}}{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{4}}}{\text{N}}{{\text{H}}_{\text{2}}} \cr}$

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IV > III > II > I
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I > III > IV > II
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I > II > III > IV
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III > I > IV > II

Basic strength in decreasing order for the following compounds is:

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I >IV > III > II
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IV > I > III > II
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II > III > I > IV
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IV > II > III > I

Which of the following statements is correct regarding the preparation of ethers?

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Ethers can be prepared by the action of Grignard regent
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Ethers can be prepared by action of diazomethane with acetic acid
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Ethers can be prepared by heating alkyl halides with dry ferrous sulphide
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Beala (b) and (c)

$k _ { h }$ (hydrolysis constant) for anilinium ion is

$2.4 \times 10 ^ { - 5 }$ , then

$\mathrm { K } _ { \mathrm { b } }$ for aniline will be:

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$4.1 \times 10 ^ { 10 }$
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$4.1 \times 10 ^ { - 10 }$
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$2.4 \times 10 ^ { 9 }$
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$2.4 \times 10 ^ { - 19 }$

The correct order of basicities of the following compounds is:

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$II> I > III > IV$
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$I > III > II > IV$
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$II > I > III > IV$
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$III > I > II > IV$

Arrange he following compounding in decreasing order of basicity

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1 > 2 > 3 > 4
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4 > 1 >2 > 3
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1 > 4 > 2 > 3
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all are incorrect

correct basic strength order is

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IV > II > III > I
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IV > II > I > IV
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III > I > II > IV
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I > IV > III > II

The correct order of basicities of the following compounds is:

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$II>I>III$
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$I>III>II$
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$III>I>II$
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$I>II>III$

Guanidine is the strongest base among neutral organic compounds. The reason for the greater basicity of guanidine is:

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presence of three nitrogen atoms in the compound
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The delocalization of lone pairs of N
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The planar structure of guanidine molecule
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The stability of conjugate acid due to resonance

Basic strength order is

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A > B > C
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B > A > C
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B > C > A
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C > B > A

Arrange the following compounds in increasing order of basicity

$CH_3 NH_2,(CH_3)_2NH,NH_3,C_6H_5NH_2$

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$C_6H_5NH_2<NH_3<(CH_3)_2NH<CH_3NH_2$
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$CH_3NH_2<(CH_3)_2NH<NH_3<C_6H_5NH_2$
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$C_6H_5NH_2<NH_3<CH_3NH_2<(CH_3)_2NH$
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$(CH_3)_2NH<CH_3NH_2<NH_3<C_6H_5NH_2$

Which of the following diazonium salts cannot be isolated ?

Arrange basicity of the following compounds in decreasing order

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I > II > III > IV
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IV > III > II > I
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III > II > I > IV
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I > III > II > IV

Which of the following is soluble in dil. aqueous

$HCl?$

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$\mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { NH } _ { 2 }$
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$\mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { CH } _ { 2 } \mathrm { NH } _ { 2 }$
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$\mathrm { C } _ { 6 } \mathrm { H } _ { 5 } \mathrm { CONH } _ { 2 }$
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Carbonyl compound and primary Amine react together to form which type of compound?

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Imines
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Aldehyde
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Amine
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Quinones

Most basic amine among the following is

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$CH_3NH_2$
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$CH_3CONH_2$
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$(CH_3)_2 NH$
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$( CH_3)_3N$

Compound

$I$ is more basic than compound

$II$ because___

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$-NO_{2}$ in compound $I$ is poor inductive group
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$-NO_{2}$ in compound $I$ is stronger inductive group
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$-NO_{2}$ in compound $I$ is stronger $-M$ group
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$-NO_{2}$ in compound $I$ is weaker $-M$ group

Choose the correct statement

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$1^{\circ}$ amine are more basic then $2^{\circ}$ amines
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$2^{\circ}$ amines are more basic than $1^{\circ}$ amines
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basicity of $1^{\circ}$ and $2^{\circ}$ amines are equal
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$1^{\circ}$ and $2^{\circ}$ amines are not basic

Which of following has least p

$K_b$ , value?

Anilines are basic due to lone pair on their nitrogen atoms. Among the following the most basic aniline is

Which of the following is strongest base?

When pure aniline is kept in air then .. colour is obtained.

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dark red
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dark pink
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black
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dark yellow

Among the following compounds, the increasing order of their basic strength is

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( I ) < ( I I ) < ( I I I ) < ( I V )
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$(I) < ( \mathrm { II } ) < ( \mathrm { IV } ) < ( \mathrm { III } )$
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( I I ) < ( I ) < ( I I ) < ( I V )
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$( \mathrm { II } ) < ( \mathrm { I } ) < ( \mathrm { IV } ) < ( \mathrm { III } )$

Among the following compounds, the correct increasing order of their basic strength is:

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$( I ) < ( I I ) < ( I II ) < ( I V )$
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$( I ) < ( I I ) < ( IV ) < ( III )$
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$( I I ) < ( I ) < ( I II ) < ( I V )$
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$( I I ) < ( I ) < ( IV ) < ( III )$

The most basic compound among the following is

Explanation

Hint: The basic character of amines is due to the presence of unshared electron pair on the nitrogen atom, which accepts a proton.

Correct Answer: Option B

Explanation of Correct Option:

The presence of electron-donating group $-C{H_3}$ , increases the electron density on the $N$ atom. So $p-toluidine$ is more basic than aniline.

B A

Explanation of incorrect options:

In molecule C there is one $- CM{e_3}$ group present ortho to the $NH_2$ group and in molecule D there are two $- CM{e_3}$ groups present ortho to the $NH_2$ group.
The steric hindrance is caused by the $CMe_3$ group present at the ortho position, which inhibits protonation of $NH_2$ and thus reduces the basicity.
The methyl group $( - C{H_3})$ is directly attached to the ring in molecule B so it increases electron density on the nitrogen atom compared to the other three molecules.

Final Step: The correct answer is option (B).

Which of these alkyl halides can be used to prepare amines using Gabriel phthalimide synthesis?

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Vinyl bromide
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1- bromo-3- methylpentane
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Bromobenzene
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2- bromo- 2,3 - dimethylbutane

What is the decreasing order of strength of the bases?
(I)

${OH}^{-}$ (ii)

${NH}_{2}^{-}$ (III)

$H-C\equiv {C}^{-}$ (IV)

${CH}_{3}{CH}_{2}^{-}$

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IV> II> III> I
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III> IV> II> I
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I> II> III> IV
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II> III> I> IV

Correct decreasing order of

$pK_b$ value of following compounds:

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I $>$ IV $>$ II $>$ III
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I $>$ II $>$ IV $>$ III
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IV $>$ I $>$ II $>$ III
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I $>$ II $>$ III $>$ IV

Which nitrogen in lysergic acid diethylamide (LSD) is most basic?

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1
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2
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3
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all are equally basic

$o-Br - C_{6}H_{5}-NH_{2}$

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aliphatic $1^{\circ}$ - amine
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aromatic $1^{\circ}$ - amine
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aliphatic $2^{\circ}$ - amine
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aromatic $2^{\circ}$ - amine

What is the most basic nature ?

Which of the following is not correct regarding basic strength ?

Which of the following compound are less basic than aniline?

$X$ is mixed with a mixture of phenol and aniline in acidic medium.The product obtained is:

Which of the following amine will be prepared by Gabriel phthalimide reaction?

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n-Butylamine
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Triethylamine
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neo-Pentylamine
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tert-Butylamine

Which of the following amines can be prepared by Gabriel phthalimide reaction?

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Neo-pentylamine
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n-butylamine
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Triethylamine
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t-butylamine

In the following compounds, the decreasing order of basic strength will be:

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$(C_2H_5)_2NH>C_2H_5NH_2>NH_3$
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$(C_2H_5)_2NH>NH_3>C_2H_5NH_2$
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$NH_3>C_2H_5NH_2>(C_2H_5)_2NH$
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$C_2H_5NH_2>NH_3>(C_2H_5)_2NH$

Explanation

Solution:- (A)

$(C_2H_5)_2NH>C_2H_5NH_2>NH_3$

Basic strength order

$(CH_3CH_2)_2NH>CH_3CH_2NH_2>NH_3$

$2^0$ amine

$1^0$ amine
Alkyl group shows

$+I$ effect, and hence increases basicity.

Ethylamine

$(C_2H_5NH_2)$ can be obtained from N-ethylphthalimide on treatment with:

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$NaBH_4$
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$CaH_2$
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$H_2O$
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$NH_2NH_2$

Explanation

Solution:- (D)

$N{H}_{2} N{H}_{2}$
1248793_1614517_ans_7b20740439de484eb62e254aba4cfe30.png

Product is:

Explanation

lone pair on N marked as (c) is most nucleophilic and form the compound as given in the reaction along with

$CH_3I$

1243200_1611384_ans_a5333491748c4ce98305d2088eea605b.PNG

What will be the product of the given reaction?

Coupling of benzene diazonium chloride with 1-napthol in alkaline medium will give:

Aniline dissolved in dilute

$HCl$ is reacted with sodium nitrite at

${0}^{o}C$ . This solution was added dropwise to a solution containing equimolar mixture of aniline and phenol in dil.

$HCl$ . The structure of the major product is:

Explanation

Aniline undergoes diazo coupling in acidic medium with

$PhN_2^{+}$
1247792_1614344_ans_918af271a4264fe0a60e546bf7883582.PNG

The correct order of basicity of the following compounds is:

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$2>1>3>4$
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$4>3>1>2$
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$3>1>2>4$
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$1>2>3>4$

Explanation

$\text{The correct order of basicity is:}$

$4>3>1>2$

$\text{The basic strength order depends on }$

$\text{Accumulation of negative charge on N (double-bonded) by another }−NH_2 \text{ group, thus intensifying the}$ $\text{ donor ability of N.}$
$\text{The higher donor ability of }sp^3\text{ hybrid N as compared to }sp^2\ N.$

Option B is correct.

1803143_1720792_ans_362a988f6f244059bf367aee68772c0c.png

Amino acid of the above ion exist as shown above at pH:

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1
0%
7
0%
11
0%
13

The correct order of basicities of the following compounds
(2)

$CH_3CH_2NH_2$
(3)

$(CH_3)_2 NH$

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2 > 1 > 3> 4
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1 > 3 > 2 > 4
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3 > 1 > 2 > 4
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3 > 2 > 1 > 4

Explanation

Basicity is the ability to donate electrons.

So, the order of basicity is:

$\mathrm{3>2>1>4}$

Hence, Option "D" is the correct answer.

The correct order of the basic strength of following compounds is:

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$4>2>3>1$
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$4>2>1>3$
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$3>1>2>4$
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$1>3>4>2$

Explanation

$\text{Higher the electron density on electron-donating group higher is the basic strength.}$

$\text{In compound 3 the electron density is highest because of }+ I\text{ effect of methyl groups attached to N}$ . $\text{Hence it has the highest basicity.}$
$\text{In compound 1 there are two amine groups attached to the carbon in which one of the amine group is always}$ $\text{available for donation. Hence it has the second-highest basicity.}$
$\text{In compound 2 again the ethyl group increases the basic strength of amine due to its }+ I\text{ effect but lower}$ $\text{than that of as in compound 3.}$
$\text{The compound 4 has the least basic strength because the carbonyl group attached to amine decreases the }$ $\text{basicity by withdrawing the lone pair from Nitrogen through resonance effect.}$

$\text{The correct order of basic strength is - }3>1>2>4$

Which of the following is the correct order of basic character ?
I. 1-Amino Propane
II. Ethanamide
III. Guanidine

$[HN=C(NH_2)_2]$
IV. Aniline

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I > II > III > IV
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III > I > IV > II
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IV > III > I > II
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III > II > I > IV

CBSE Questions for Class 12 Medical Chemistry Organic Compounds Containing Nitrogen Quiz 14 - MCQExams.com

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Practice Class 12 Medical Chemistry Quiz Questions and Answers

CBSE Questions for Class 12 Medical Chemistry Organic Compounds Containing Nitrogen Quiz 14 - MCQExams.com

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Practice Class 12 Medical Chemistry Quiz Questions and Answers

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