CBSE Questions for Class 12 Engineering Chemistry Haloalkanes And Haloarenes Quiz 4 - MCQExams.com

What will be the product of following reaction

            $$\overset{OH}{|}$$  $$\overset{OH}{|}$$
$$CH_3-C-C-CH_3\xrightarrow[]{H_2SO_4}Q$$
            $$\underset{H}{|}$$      $$\underset{H}{|}$$

Q is ___________.
  • $$CH_3-C-CH_2-CH_3$$
    $$\; \; \; \; \;\; \; \; \; \;\; \; \underset{O}{||}$$
  • $$CH_3-C=CH-CH_3$$
    $$\; \; \; \; \;\; \; \; \; \; \underset{OH}{|}$$
  • Both
  • None
Consider following three halides:
(I)  $$C{H}_{3}-C{H}_{2}-Cl$$  ;
(II)  $$C{H}_{2}=CH-Cl$$  ;
(III)  $${C}_{6}{H}_{5}Cl$$
Arrange $$C-Cl$$ bond length of these compounds in decreasing order.
  • $$I > II > III$$
  • $$I > III > II$$
  • $$III > II > I$$
  • $$II > III > I$$
The product in the following reaction is:
$$Ph - Cl + {Fe}/{{Br}_{2}}  \longrightarrow $$ Product
  • o-bromo-chloro benzene
  • p-bromo-chloro benzene
  • both of the above
  • 2,4,6-tribromo chloro benzene
The least reactive chlorine is present in:
  • Methyl chloride
  • Allyl chloride
  • Ethyl chloride
  • Vinyl chloride
Which of the following compound is optically active?
  • $$CH_3 CH_2 COOH$$
  • $$CH_3 CHOH COOH$$
  • $$HOOC.CH_2.COOH$$
  • $$CH_3.CO.COOH$$
Bond order of $$C-X$$ bond is:
  • $$1$$
  • $$2$$
  • $$0.5$$
  • $$0$$
Which is the correct increasing order of bond length of $$C-X$$ bond?
  • $$C-F , C-Cl , C-Br , C-I $$
  • $$C-Cl , C-F , C-Cl , C-Br $$
  • $$C-Br , C-F , C-Cl , C-I $$
  • $$C-Cl , C-F , C-Br , C-I $$
$$C-X$$ bond is polar because:
  • $$X$$ is more electronegative than $$C$$
  • $$X$$ attracts electron cloud to itself
  • $$X$$ gains slight negative charge on it and $$C$$ gains slight positive charge on it
  • all of these
Which is the correct increasing order of dipole moment of $$C-X$$ bond?
  • $$C-F, C-Cl, C-Br, C-I$$
  • $$C-Br, C-F, C-Cl, C-I$$
  • $$C-Cl , C-F , C-Br , C-I$$
  • $$C-I , C-Br , C-F , C-Cl$$
Which alky halide has maximum density?
  • $$C_3H_7F$$
  • $$C_2H_5Cl$$
  • $$CH_3Br$$
  • $$CH_3I$$
Which of the following does not give white precipitate when boiled with alcoholic silver nitrate:
  • allyl chloride
  • t-butyl chloride
  • chlorobenzene
  • benzyl chloride
Consider a compound:$$A-CH_2-Cl$$
$$A$$ can be any group. Select the correct statement(s).
  • If $$A=-NO_2$$,$$C-Cl$$ bond polarity increases.
  • If $$A=-NO_2$$,$$C-Cl$$ bond polarity decreases.
  • If $$A=-OCH_3$$,$$C-Cl$$ bond polarity increases.
  • If $$A=-OCH_3$$,$$C-Cl$$ bond polarity decreases.
Which of the following has least polar $$C-X$$ bond?
  • $$H_3C-CH=CH_2-Cl$$
  • $$HO-CH=CH_2-Cl$$
  • $$O_2N-CH=CH_2-Cl$$
  • $$HS-CH=CH_2-Cl$$
which of the following compound is the best starting material for reaction:
641726_1ff6709298034d2fb781b73c454e4de1.PNG
With respect to chlorobenzene, which of the following statements is not correct?
  • $$Cl$$ is ortho-para directing
  • $$Cl$$ exhibits $$+M$$ effect
  • $$Cl$$ is ring deactivating
  • $$Cl$$ is meta directing

What is the sum of positions assigned to bromine while numbering the Parent Chain in the below compounds ? 


1384614_6e1b5cf36e214c90aaaabe3451a10f82.PNG
  • $$13$$
  • $$14$$
  • $$15$$
  • $$16$$
The conversion given can be effected using
1393364_de245e2049324c528c15b1e1360d5d8f.PNG
  • $${Br}_{2}/C{Cl}_{4}$$
  • $${Br}_{2}/{H}_{2}O$$
  • $${Br}_{2}/Fe$$
  • $${Br}_{2}$$/benzoyl peroxide
When ethyl iodide and propyl iodide react with Sodium in presence of ether they form ?
  • Only one alkane
  • Mixture of two alkane
  • Mixture of three alkane
  • Mixture of four alkane
Phenylbenzoate when treated with $$Br_{2}/Fe$$ gives:
Identify the product Z of the given reaction.
1400268_48c40693587549b3822e95316dd8e9a9.PNG
$$B\overset { alc.KOH }{ \longleftarrow  } C_{ 2 }H_{ 5 }Cl\overset { Zn-Cu }{ \underset { { C }_{ 2 }{ H }_{ 5 }OH }{ \longrightarrow  }  } A.$$
Here A and B are respectively:
  • $$CH_4,C_2H_4$$
  • $$C_2H_4,C_2H_6$$
  • $$C_2H_6,C_2H_4$$
  • $$C_2H_6,CH_4$$
The halide which will not react with benzene in presence of anhydrous $$AlCl_{3}$$ is
  • $$CH_{3}CHClCH_{3}$$
  • $$C_{6}H_{5}CH_{2}Cl$$
  • $$C_{6}H_{5}Cl$$
  • $$CH_{3}CH_{2}CH_{2}Cl$$
An organic molecule necessarily shows optical activity if it:
  • contains asymmetric carbon atoms
  • in non polar
  • is non superimposable on its mirror image
  • is superimposable on its mirror Image
Which one of the following will not be able to show optical isomerism?
  • 1,2 -Propadiene
  • 2, 3 -Propadiene
  • sec- Butyl alcohol
  • 2, 3- Butanediol
The major product of the elimination is 
1464764_f18cc652fc6f4457807f5a2a66d4b9b7.jpg
  • $$H_2C=CH_2$$
  • $$H_2C=CH-CH_3$$
  • none of these
The order of reactivity of alkyl halides in Wurtz reaction is 
  • R-I >R-Br >R-Cl
  • R-I < R-Br < R-Cl
  • R-Br > R-I < R- Cl
  • R-I > R-Cl > R - Br
If dichloromethane (DCM) and water $$ \left(\mathrm{H}_{2} \mathrm{O}\right)  $$ are used for differential extraction, which one of the following statements is correct?
  • DCM and $$ \mathrm{H}_{2} \mathrm{O} $$ would stay as lower and upper layer respectively in the separating funnel (S.F.)
  • DCM and $$ \mathrm{H}_{2} \mathrm{O} $$ will be miscible clearly
  • $$ \mathrm{DCM} $$ and $$ \mathrm{H}_{2} \mathrm{O} $$ would stay as upper and lower layer respectively in the separating funnel (S.F.)
  • DCM and $$ \mathrm{H}_{2} \mathrm{O} $$ will make trubid/colloidal mixture
Which of the following is/are optically active:-
Which is incorrect reactivity order towards nucleophilic reaction?
$$  (CH_3)_2C=CH_3 \quad \underset { \overrightarrow { P{ h }_{ 2 }{ O }_{ 2 } }  }{ HBr } \quad A\quad \underset { \overrightarrow { Drey\quad Ether }  }{ Na } \quad B,\quad \\ $$
$$B$$ is:-
  • $$(CH_3)_2CH_2Br$$
  • $$(CH_3)_3CBr$$
  • $$(CH_3)_3C-C(CH_3)_3$$
  • $$(CH_3)_2(CH_2)_2(CH_3)_2$$
A enantiomerically pure acid is treated with racemic mixture of an alcohol having one chiral carbon. The ester formed will be
  • optically active mixture
  • pure enantiomer
  • meso compound
  • racemic mixture
Vinyl cholride is more reactive than allyl chloride.
  • True
  • False
statement I : Iodination of methane is carried out in presence of $${ HNO }_{ 3 }$$ or $${ HIO }_{ 3 }$$
statement II : $${ HNO }_{ 3 }$$ or $${ HIO }_{ 3 }$$ oxides HI to $${ I }_{ 2 }$$ to prevent backwards reactions.
  • Both statements are correct.
  • Both statements are incorrect.
  • statement - I is correct, statement - II is incorrect.
  • statement - I is incorrect, statement - II is correct.

What is the IUPAC name of the given compound?
1475917_c0dd727b49754b42ac4fdc391879f87a.png
  • 2,2 -dibromoethane
  • 3,3 -dibromoethane
  • 1,2 -dibromoethane
  • 1,2- dibromopropane
If isopropyl chloride and ethyl chloride both react with Na in presence of dry ether which alkanes will be obtained?
  • n-Butane
  • 2-methyl butane
  • 2, 3-Dimethyl butane
  • All of them
Number of $$C$$ atoms which present in vinyl acetylene is  
  • 2
  • 3
  • 4
  • 1
Which if the following alkane is not produced when the mixture methyl chloride and ethyl chloride is subjected to wurtz reaction?
  • Ethane
  • Propane
  • n-butane
  • n-pentane
Which hydrocarbon (molecular mass = 72) would yield three different monochloro derivatives?
  • n-Pentane
  • Iso-pentane
  • n-Hexane
  • Iso-hexane
Which one of the following will form cyclohexane on reaction with two molecules of Na in ether.
  • $$ CH_3CH_2-Br $$
  • $$ Br-CH_2-CH_2-CH_2-CH_2-CH_2-CH_2-Cl $$
Which of the following halides is most reactive in an $${ E }_{ 2 }$$ reaction with sodium methoxide 
  • $$\left( { CH }_{ 3 } \right) _{ 3 }{ CCH }_{ 2 }I$$
  • $$\left( { CH }_{ 3 } \right) _{ 2 }CHCHICH_{ 3 }$$
  • $$\left( { CH }_{ 3 } \right) _{ 2 }{ CHCH }_{ 2 }Br$$
  • $$\left( { CH }_{ 3 } \right) _{ 2 }{ CHCH }_{ 2 }Cl$$
The number of stereoisomers possible for a compound of the molecular formula $$ \mathrm { CH } _ { 3 } - \mathrm { CH } = \mathrm { CH } - \mathrm { CH } ( \mathrm { OH } ) \mathrm { Me } $$ is
  • 4
  • 6
  • 3
  • 2
Choose the correct statement about the following 
1515002_588ccd3452ae4843857f6d3bd340aa0d.PNG
  • Both are chiral and $$(I)$$ is $$'R'$$ and $$(II)$$ is $$'S'$$
  • Both have chirality of plane and configuration at $$(I)$$ is $$'R'$$ and $$(II)$$nd is $$'S'$$
  • Both are achiral and possess plane of symmetry
  • $$I$$ has higher $$pKa$$ value  for 1st deprotonation than $$II$$
What happens when chlorobenzene is treated with $$KOH$$?
  • Phenol
  • $$KCl$$
  • $$Both\ A\ and\ B$$
  • $$No\ reaction\ takes\ place$$
How will  you prepare iodoethane from bromoethane:
  • $$AgI$$
  • $$AgI/ $$acetone
  • $$NaI$$
  • $$NaI/$$acetone
Optical activity is shown by :
  • Glucose
  • Fructose
  • Sucrose
  • All of these
$$C_6H_5CHO+HCN\rightarrow C_6H_5-$$  $$C_{\mid_OH}^{\mid ^{H}}-CH$$
The product would be
  • A racemate
  • Optically active
  • A meso compound
  • A mixture of diastereomers
Which of the following statements are correct about nucleophilic acyl substitution?
  • $$RCOCl$$ is more reactive than $$RCO{N}_{3}$$ (acid azide)
  • $$RCO{N}_{3}$$ is more reactive than anhydride
  • $$RCO{N}_{3}$$ is less reactive than anhydride
  • Esters are less reactive than anhydrides but more reactive than amides
Reaction of alkyl halide with metallic sodium in presence of dry ether solution is called:
  • Gabriels reaction
  • Friedel-Crafts reaction
  • Sandmeyers reaction
  • Wurtz reaction
Ethyl bromide on boiling with alcoholic solutions of sodium hydroxide forms:
  • ethane
  • ethylene
  • methylene
  • all of these
Product (C) is:
1768751_b30cc5e599c94f9b8bd4fa3e5ec71508.png
  • None
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