MCQ Questions for Class 12 Engineering Chemistry Alcohols,Phenols And Ethers Quiz 13

The correct order of acidity for the following compound is

0%
I > II > III > IV
0%
III > I > II > IV
0%
III > IV > II > I
0%
I > III > IV > II

Correct name of the given compound is

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$(2R, 3E) 4$ -bromo pentan- $2$ -ol
0%
$(2S, 3E) 4$ -bromo pentan- $2$ -ol
0%
$(2R, 3Z) 4$ -bromo pentan- $2$ -ol
0%
$(2S, 3Z) 4$ -bromo pentan- $2$ -ol

In the dehydration reaction ,

$^{18}O$ will be in

0%
$H_2O$
0%
A
0%
Both (A) and (B)
0%
None of these

Correct order of basic strength:

0%
$C{ H }_{ 3 }N{ H }_{ 2 } > C{ H }_{ 3 }-\overset { \oplus }{ N } { H }_{ 3 }>C{ H }_{ 3 }-\overset { \circleddash }{ N } H$
0%
$\overset { \circleddash }{ O } H > C{ H }_{ 3 }CO\overset { \circleddash }{ _2 } >C{ l }^{ \circleddash }$
0%
$C{ H }_{ 3 }N{ H }_{ 2 } > C{ H }_{ 3 }-\overset { \oplus }{ N } { H }_{ 3 }>C{ H }_{ 3 }-CH_2-\overset { \circleddash }{ N } H$
0%
$CH_{3}CH_{2}NH_{2} > CH_{2}=CH-NH_{2} > HC \equiv C-\overset{ \circleddash }{ N }H$

The correct IUPAC nomenclature for the following alcohol is:

0%
2-ethyl-2 butanol
0%
3-methyl-3 pentanol
0%
3-ethyl-3-methyl-3 pentanol
0%
1,1 -diethylene

Which of the following is represented by general formula

$C_{n} H_{2n + 2} O$ ?

0%
Alcohols only
0%
Both alcohols and ethers
0%
Aldehydes only
0%
Both aldehydes and ketones

$(a)\quad Secondary\quad alcohol\quad \xrightarrow [ \Delta ]{ H_{ 3 }PO_{ 4 } }$

$(b)\quad Tertiary\quad alcohol\quad \xrightarrow [ \Delta ]{ H_{ 3 }PO_{ 4 } }$
For the above dehydration reaction rate of reaction will be:

0%
a > b
0%
a < b
0%
a = b
0%
None

The major product is:

Identify:

Which of the following is dehydrated most easily?

Which one has minimum

$\%$ of enol content?

Alkyl halides can be converted to ethers through:

0%
Frankland reaction
0%
Williamson synthesis
0%
Fitting reaction
0%
Grignard reaction

What is the major product A?

Dehydration of alcohol to alkene involves all the steps, except:-

0%
combination with proton
0%
formation of cabonium ion by removal of water molecule
0%
loss of proton from carbonium ion from the $\beta$ -position
0%
loss of proton from carbonium iron from $\alpha$ -position

The IUPAC name of

figure

0%
0%
0%
0%
None of these

Which of the following is the best set of reagents to perform the above conversion?

0%
$ThO_{2},\Delta$
0%
$H_{3}PO_{4},\Delta$
0%
$conc.H_{2}SO_{4},\Delta$
0%
$Al_{2}O_{3},\Delta$

Major product of the following reaction is

Which of the following will be the correct product of reaction?

The major product in the acid catalysed dehydration of 2-pentanol is

0%
Pent-1-ene
0%
Pent-2-ene
0%
Pent-3-ene
0%
Methylbut-1-ene

The IUPAC name of

Propene is subjected to acidic hydration and hydroboration oxidation in two different experiments. The products obtained respectively are

0%
n-propyl alcohol, n-propyl alcohol
0%
isopropyl alcohol, isopropyl alcohol
0%
n-propyl alcohol, isopropyl alcohol
0%
isopropyl alcohol, n-propyl alcohol

What is the reagent used and appropriate temperature required to prepare ethene from ethyl alcohol?

0%
Dilute $H _ { 2 } S O _ { 4 } , 160 ^ { \circ } C$
0%
Concentrated $H _ { 2 } S O _ { 4 } , 170 ^ { \circ } C$
0%
Dilute $H C l , 170 ^ { \circ } C$
0%
Concentrated $H C l , 160 ^ { \circ } C$

Which of the following is most reactive toward acid catalyzed dehydration?

Which of the following is most acidic?

0%
${ CH }_{ 3 }OH$
0%
${ CH }_{ 3 }{ CH }_{ 2 }OH$
0%
$({ CH }_{ 3 })_{ 2 }CHOH$
0%
$({ CH }_{ 3 })_{ 3 }COH$

The sum of locants of the compound is _________

0%
10
0%
8
0%
9
0%
7

Examine the following structures:-

$(A)$

$(CH_3)_3C-OH$

$(B)$

$(CH_3)_3C-NH_2$
Which of the following statement is correct ?

0%
A is tertiary alcohol while $B$ is tertiary amine.
0%
A is primary alcohol while $B$ is primary amine.
0%
$\mathrm{A}$ is tertiary alcohol while $\mathrm{B}$ is primary amine.
0%
A is primary alcohol while $B$ is tertiary amine.

In the following reaction A and B respectively are

0%
${ 3 }^{ \circ }$ and ${ 1 }^{ \circ }$ alcohols
0%
${ 3 }^{ \circ }$ and ${ 2 }^{ \circ }$ alcohols
0%
Both ${ 2 }^{ \circ }$ alcohols
0%
${ 2 }^{ \circ }$ and ${ 1 }^{ \circ }$ alcohols

Which of these dehydrates most readily when reacts with conc.

${H}_{2}{PO}_{4}$

0%
0%
0%
0%
both A and B will form

IUPAC name of compound 'X' is

0%
Cyclohex -1- en -3-ol
0%
Cyclohex -2-en-1-ol
0%
Cyclohex-5-en-2-ol
0%
Cyclohex-5-en-1-ol

The IUPAC name of

0%
1-ethoxypropane-2-ol
0%
3-ethoxypropane-2-ol
0%
1-ethoxy-2-hydroxy propane
0%
None of these

$Compound( Refer \ Image)\xrightarrow [ Conc.{ H }_{ 2 }{ SO }_{ 4 } ]{ \triangle }$

The major product obtained in the above reaction is:

When vapours of methyl alcohol are passed under pressure over heated

$Al_2O_3$ at

$250^o C$ , the product obtained is:

0%
dimethyl ether
0%
ethyl methyl ether
0%
diethyl ether
0%
none of these

Explanation

When vapours of alcohol are passed under pressure over heated

$Al_2O_3$ at

$250^0C$ , the product obtained is dimethyl ether

$CH_3OH+HO-CH_3\overset{Al_2O_3}{\rightarrow}CH_3-O-CH_3+H_2O$

In the following compounds phenol (I) p-cresol (II) m-nitrophenol (III) and p-nitrophenol (IV) the order of acidity is:

0%
III > IV > I > II
0%
I > IV > III > II
0%
II > I > III > IV
0%
IV > III > I > II

Explanation

Acidic compounds are the compound that can donate a proton easily. The compound that donates more protons possesses high acidic strength.

Acidic strength depends upon

$2$ factors:

$1)$ Electron withdrawing group

$:$ If the electron-withdrawing group is present on any acidic compound it will increase the acidic Strength of that compound.

$2)$ Electron donating groups

$:$ If the electron-donating group is present on any acidic compound it will decrease the acidic Strength of that compound.

$(I)$ In

$phenol$ , we have a

$OH$ group on the benzene ring. It acts as an electron-withdrawing and electron releasing group. It is acidic.

$(II)$ In

$p-cresol,$ has

$CH_3$ group on phenol which decreases the acidic strength since it is an electron-donating group

$(III)$ In

$m-nitrophenol$ has

$NO_2$ on

$m$ position i.e., on

$3$ position of phenol .

$NO_2$ is an electron-withdrawing group, it increases the acidic strength of the compound. Therefore the acidic strength of this compound will be higher than the above two compounds.

$(IV)$ In

$p-nitrophenol$ has

$NO_2$ on

$P$ position i.e., on

$4$ position of phenol .

$NO_2$ is an electron-withdrawing group, it increases the acidic strength of the compound. They also show intermolecular hydrogen bonding but this intermolecular hydrogen bonding is not easily possible in

$m-nitrophenol$ .Thus

$p-nitrophenol$ is more acidic than

$m-nitrophenol$

$\therefore$ The decreasing order of acidity is

$IV > III > I > II$

$\mathbf{Hence\ the\ correct\ answer\ is\ option\ (D)}$

Which is dehydrated to a maximum extent using conc.

$H_2 SO_4$ ?

Explanation

Extent of dehydration using conc.

$\mathrm{H_2SO_4}$ depends upon the stability of intermediate carbonium ion formed in the reaction.

Among the given options, Intermediate carbonium ion formed in the above reaction has highest stability.

Hence, Option "D" is the correct answer.

Cyclopentanol on reaction with NaH followed by

$CS_2$ and

$CH_3I$ produces a/an:

0%
ketone
0%
alkene
0%
ether
0%
xanthate

Heating together of sodium ethoxide and ethyl iodide will give :

0%
ethyl alochol
0%
acetadehyde
0%
diethyl ether
0%
acetic acid

Dehydration of alcohol involves:

0%
free radical
0%
carbocation
0%
carbanion
0%
carbene

Which of the following pairs of reagents will not form ether?

0%
$C_2H_5Br + CH_3COONa$
0%
$C_2H_5Br + C_2H_5ONa$
0%
$C_2H_5 Br + (CH_3 )_2 CHONa$
0%
$(CH_3)_2CHBr + CH_3ONa$

Explanation

The reaction

$\mathrm{C_2H_5Br + CH_3COONa}$ results in the formation of

$\mathrm{CH_3COOCH_2CH_3}$

Reaction of

$\mathrm{RBr + R'ONa}$ results in the formation of Ether

$\mathrm{(ROR')}$

Hence, Option "A" is the correct answer

Main product(s) of the reaction is/are:

0%
$CH_3COOH+ H_2$
0%
$CH_3CH_2COOH$
0%
$CH_3CH(OH)CH_3$
0%
$CH_3CH_2OH$

Ether form peroxide in contact with air and light and it may cause explosion, since the boiling point of peroxide is:

0%
equal to ether
0%
lower than ether
0%
higher than ether
0%
none of these

State whether the following statement is True or False.
Primary alcohols are dehydrated easily than secondary and teritary alcohols.

0%
True
0%
False

State, whether the following statements are True or False:
2-Aminoethanol is formed when ethylene oxide combines with ammonia.

0%
True
0%
False

State, whether the following statements are True or False:
Ethers are more polar than the isomeric alcohols.

0%
True
0%
False

Which of the following reactions will give good yield of ether?

An ether is more volatile than an alcohol having the same molecular formula, This is due to:

0%
dipolar character of ethers
0%
alcohols having resonance structures
0%
intermolecular hydrogen bonding in ethers
0%
intermolecular hydrogen bonding in alcohols

Explanation

An ether is more volatile than an alcohol having same molecular formula because intermolecular hydrogen bonding in alcohols.

The

$-OH$ group of alcohol can form intermolecular hydrogen bonds whereas

$-O$ group of ethers cannot form hydrogen bonds.

Hydrogen bond formation is possible when

$H$ atom is attached to electronegative

$N$ ,

$O$ or

$F$ atom. Intermolecular hydrogen bonds leads to molecular association.

Hence correct answer is option D.

Which of the following will be most easily dehydrated in acidic conditions?

Identify (Z) in the series,

$C_3H_7OH\overset{Conc. H_2SO_4}{\underset{170^oC}{\rightarrow}}(X)\overset{Br_2}{\rightarrow}(Y)\overset{Excess of}{\underset{Alc. KOH}{\rightarrow}}(Z)$

0%
0%
0%
$CH_3-C\equiv CH$
0%

Tert- butyl alcohol is:

0%
$2$ -methyl propan- $2$ -ol
0%
$2$ -methyl propan- $1$ -ol
0%
$3$ -methyl butan- $1$ -ol
0%
$3$ -methyl butan- $2$ -ol

CBSE Questions for Class 12 Engineering Chemistry Alcohols,Phenols And Ethers Quiz 13 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

CBSE Questions for Class 12 Engineering Chemistry Alcohols,Phenols And Ethers Quiz 13 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

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