Chemistry - Haloalkanes Haloarenes - Quiz-2 - MCQExams.com

The reaction of toluene with ${Cl}_{2}$ in presence of ${FeCl}_{3}$ gives predominantly :

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m- chlorobenzene
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benzoylchloride
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benzyl chloride
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O^- and p-chlorotoluene

The nitration of nitrobenzene with fuming HNO₃ will give:

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TNB
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1,3-dinitrobenzene
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picric acid
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1,4-dinitrobenzene

Arrange the following alkyl halides in the decreasing order of $S_{N} 1$ reactivity

(I) ${CH}_{3} {CH}_{2} {CH}_{2} Cl$

(II) ${CH}_{2} = CHCH (Cl) {CH}_{3}$

(III) ${CH}_{3} {CH}_{2} CH (Cl) {CH}_{3}$

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

Butanenitrile may be prepared by heating-

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Propyl alcohol with KCN
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Butyl chloride with KCN
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Butyl alcohol with KCN
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Propyl chloride with KCN

The correct order of solvolysis in the following alkyl halide is

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> ${CH}_{2} = CH - {CH}_{2} Cl$ > ${CH}_{3} {CH}_{2} {CH}_{2} Cl$
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${CH}_{2} = CH - {CH}_{2} Cl$ > > ${CH}_{3} {CH}_{2} {CH}_{2} Cl$
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${CH}_{3} {CH}_{2} {CH}_{2} Cl$ > ${CH}_{2} = CH - {CH}_{2} Cl$ >
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${CH}_{2} = CH - {CH}_{2} Cl$ > ${CH}_{3} {CH}_{2} {CH}_{2} Cl$ >

The products of reaction of alcoholic silver nitrite with ethyl bromide are :

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Ethane
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Ethene
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Ethyl alcohol
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Nitroethane

Order of nucleophilicity in polar protic solvent is

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$I^{-} > {Br}^{-} > F^{-} > {Cl}^{-}$
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$F^{-} > {Cl}^{-} > {Br}^{-} > I^{-}$
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$I^{-} > {Cl}^{-} > F^{-} > {Br}^{-}$
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$I^{-} > {Br}^{-} > {Cl}^{-} > F^{-}$

Phenylmagnesium bromide reacts with methanol to give

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A mixture of toluene and Mg(OH)Br
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A mixture of phenol and Mg(Me)Br
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A mixture of anisole and Mg(OH)Br
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A mixture of benzene and Mg(OMe)Br

Debromination of meso-dibromobutane gives mainly

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n-Butane
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1-Butene
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cis-2-Butene
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trans-2-Butene

Benzoylchloride is prepared from benzoic acid by

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${Cl}_{2}$ , hv
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${SO}_{2}$ , ${Cl}_{2}$
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${SOCl}_{2}$
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${Cl}_{2}$ , $H_{2} O$

Which haloarenes is most reactive towards electrophilic subsititution reaction?

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Which nitro derivative of haloarene is most reactive towards nucleophilic substitution reaction?

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Which process does not occur during formation of CHCl₃ from C₂H₅OH and bleaching powder?

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Hydrolysis
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Oxidation
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Elimination
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Chlorination

Which of the following compounds undergo E₂ reactions more easily?

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$({CH}_{3})_{2} C . \underset{|}{C} H_{2} {CH}_{3} Br$
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CH₃(CH₂)₂CH₂Cl
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CH₃(CH₂)₂CH₂I
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$I ({CH}_{3})_{2} - \overset{|}{C} - {CH}_{2} {CH}_{3}$

Which is most reactive for S_N2 reactions ?

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CH₃I
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C₂H₅I
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C₃H₇I
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C₄H₉I

$\overset{Na / Dry ether}{\to}$ (A)

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Product (A) of above reaction is:

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The hydrogen most readily abstract by Br radical is -

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a
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b
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c
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d

Product obtained in above Wurtz reaction is:-
$\overset{N a (D r y e t h e r)}{\to}$

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Both (1) and (2)

$Cl - {CH}_{2} - {C_{|}^{|}}_{{CH}_{3}}^{{CH}_{3}} - {CH}_{2} - {CH}_{2} - Cl + I^{-} - - - > Product$
The major product of the above reaction is:-

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$I - {CH}_{2} - {C_{|}^{|}}_{{CH}_{3}}^{{CH}_{3}} - {CH}_{2} - {CH}_{2} - Cl$
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$Cl - {CH}_{2} - {C_{|}^{|}}_{{CH}_{3}}^{{CH}_{3}} - {CH}_{2} - {CH}_{2} - I$
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$H_{2} C = \overset{{CH}_{3}}{\overset{|}{C}} - {CH}_{2} - {CH}_{2} = Cl$
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$Cl - {CH}_{2} - {C_{|}^{|}}_{{CH}_{3}}^{{CH}_{3}} - {CH}_{2} = {CH}_{2}$

+ NaI (1 mole) $\overset{Acetone}{\to}$ (A); Major product of this reaction is:

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Which of the following alkyl halide undergo rearrangement in S_N1 reaction?

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$\begin{matrix} {CH}_{3} & - & \underset{{CH}_{3}}{\underset{|}{\overset{{CH}_{3}}{\overset{|}{C}}}} & - & \underset{I}{\underset{|}{CH}} & - & {CH}_{3} \end{matrix}$
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All of these

The correct sequence among the following for above mentioned three chlorides in decreasing order towards S_N1 reactivity is -

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

Which compound undergoes nucleophilic substitution with NaCN at the fastest rate ?

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Rank the following in order of decreasing rate of solvolysis with aqueous ethanol (fastest $\to$ slowest)

$C H_{3} | H_{2} C = C — B r (1)$ $B r | C H_{3} - C H C H_{2} C H {(C H_{3})}_{2}$

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

Which of the following reactant will not favour S_N2 nucleophilic substitution reaction?

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Ph-Br
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${CH}_{3} - {C_{|}^{|}}_{{CH}_{3}}^{{CH}_{3}} - {CH}_{2} - Br$
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All of the above

$\overset{NBS}{\to}$ (A) $\overset{{CH}_{3} SNa}{\to}$ (B), Product (B) is:

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None of these

What is the major product of the following reaction?

$H_{2} C = CH - {CH}_{2} - OH \to_{excess}^{HBr} Product$

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${CH}_{3} - \overset{Br}{\overset{|}{CH}} - {CH}_{2} - Br$
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$H_{2} C = CH - {CH}_{2} - Br$
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${CH}_{3} - \overset{Br}{\overset{|}{CH}} - {CH}_{2} - OH$
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${CH}_{3} - \overset{O H}{\overset{|}{CH}} - {CH}_{2} - OH$

1.

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S_N1 and S_N2 products are the same with (excluding stereoisomer):-
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&nsp;2.
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3.
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4.

Addition of KI accelerates the hydrolysis of primary alkyl halides because:

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KI is soluble in organic solvents
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the iodide ion is a weak base and a poor leaving group
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the iodide ion is a strong base
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the iodide ion is a powerful nucleophile as well as a good leaving group

$\to_{S_{N} 2 conditions}^{LiBr} Major product$ (X)

The product X in the above mentioned reaction is -

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0:0:1

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