JEE Main Haloalkanes and Haloarenes Practice Questions With Solutions

Identify A and B in the following reaction sequence.

The product (C) in the below mentioned reaction is :

${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{Br}\underset{\mathrm{\Delta }}{\overset{{\mathrm{KOH}}_{(\text{alc) }}}{\to }}\mathrm{A}\stackrel{\mathrm{HBr}}{\to }\mathrm{B}\underset{{\mathrm{KOH}}_{(\mathrm{aq})}}{\overset{\mathrm{\Delta }}{\to }}\mathrm{C}$CH_{3} - CH_{2} - CH_{2} - Br \rightarrow_{\Delta }^{KOH_{\left(\right. \text{alc})\textrm{ }} } A \overset{HBr }{\rightarrow} B \rightarrow_{KOH_{\left(\right. aq \left.\right)} }^{\Delta } C

Given below are two statements:

Statement - I: High concentration of strong nucleophilic reagent with secondary alkyl halides which do not have bulky substituents will follow ${\mathrm{S}}_{\mathrm{N}}{}^2$S_{N} ^{2} mechanism.

Statement - II: A secondary alkyl halide when treated with a large excess of ethanol follows ${\mathrm{S}}_{\mathrm{N}}{}^1$S_{N} ^{1} mechanism.

In the light of the above statements, choose the most appropriate from the options given below:

Example of vinylic halide is :

The final product A, formed in the following multistep reaction sequence is :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : ${\mathrm{CH}}_2=\mathrm{CH}-{\mathrm{CH}}_2-\mathrm{Cl}$CH_{2} = CH - CH_{2} - Cl is an example of allyl halide.

Reason (R) : Allyl halides are the compounds in which the halogen atom is attached to ${\mathrm{sp}}^2$sp^{2} hybridised carbon atom.

In the light of the above statements, choose the most appropriate answer from the options given below :

Alkyl halide is converted into alkyl isocyanide by reaction with

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R :

Assertion A : Aryl halides cannot be prepared by replacement of hydroxyl group of phenol by halogen atom.

Reason R : Phenols react with halogen acids violently.

In the light of the above statements, choose the most appropriate from the options given below :

Identify B formed in the reaction.

$\mathrm{Cl}-{\left({\mathrm{CH}}_2\right)}_4-\mathrm{Cl}\stackrel{\text{ excess }{\mathrm{NH}}_3}{\to }\mathrm{A}\stackrel{\mathrm{NaOH}}{\to }\mathrm{B}+{\mathrm{H}}_2\mathrm{O}+\mathrm{NaCl}$Cl - \left(\left(\right. CH_{2} \left.\right)\right)_{4} - Cl \overset{\textrm{ }\text{excess}\textrm{ } NH_{3} }{\rightarrow} \textrm{ } A \overset{NaOH }{\rightarrow} B + H_{2} O + NaCl

Which among the following halide/s will not show ${\mathrm{S}}_{\mathrm{N}}1$S_{N} 1 reaction:

(A) ${\mathrm{H}}_2\mathrm{C}=\mathrm{CH}-{\mathrm{CH}}_2\mathrm{Cl}$H_{2} C = CH - CH_{2} Cl

(B) ${\mathrm{CH}}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{Cl}$CH_{3} - CH = CH - Cl

(C)

(D)

Choose the most appropriate answer from the options given below :