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Haloalkanes and Haloarenes

6 Board Chemistry previous year questions on Haloalkanes and Haloarenes — free to practice, unlock the correct answer & explanation with Premium.

The products A and B in the following reactions, respectively are

$A \overset{A g - N O_{2}}{\leftarrow} C H_{3} - C H_{2} - C H_{2} - B r \overset{A g C N}{\to} B$

[JEE Main 2025, 28 Jan (Shift 1)]

$C H_{3} - C H_{2} - C H_{2} - N O_{2}, C H_{3} - C H_{2} - C H_{2} - C N$

$C H_{3} - C H_{2} - C H_{2} - O N O, C H_{3} - C H_{2} - C H_{2} - N C$

$C H_{3} - C H_{2} - C H_{2} - O N O, C H_{3} - C H_{2} - C H_{2} - C N$

$C H_{3} - C H_{2} - C H_{2} - N O_{2}, C H_{3} - C H_{2} - C H_{2} - N C$

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The correct statement regarding nucleophilic substitution reaction in a chiral alkyl halide is ;

[JEE Main 2024, 27 Jan (Shift 1)]

Racemisation occurs in $S_{N} 1$ reaction and inversion occurs in $S_{N} 2$ reaction.

Racemisation occurs in $S_{N} 1$ reaction and retention occurs in $S_{N} 2$ reaction.

Retention occurs in $S_{N} 1$ reaction and inversion occurs in $S_{N} 2$ reaction

Racemisation occurs in both $S_{N} 1$ and $S_{N} 2$ reactions

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Identify correct statement/s :

(A) $- O C H_{3}$ and $- N H C O C H_{3}$ are activating group.
(B) - CN and - OH are meta directing group.
(C) - CN and $- S O_{3} H$ are meta directing group.
(D) Activating groups act as ortho - and para directing groups.
(E) Halides are activating groups.

Choose the correct answer from the options given below :

(A), (C) and (D) only

(A) and (C) only

(A) only

(A), (B) and (E) only

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The products A and B in the following reactions, respectively

$(A) \overset{{AgNO}_{2}}{\leftarrow} {CH}_{3} {CH}_{2} {CH}_{2} Br \overset{AgCN}{\to} (B)$

(Memory-based Question 28/ Jan/25 morning shift )

${CH}_{3} - {CH}_{2} - {CH}_{2} - ONO, {CH}_{3} - {CH}_{2} - {CH}_{2} - CN$

${CH}_{3} - {CH}_{2} - {CH}_{2} - {NO}_{2}, {CH}_{3} - {CH}_{2} - {CH}_{2} - NC$

${CH}_{3} - {CH}_{2} - {CH}_{2} - {NO}_{2}, {CH}_{3} - {CH}_{2} - {CH}_{2} - CN$

${CH}_{3} - {CH}_{2} - {CH}_{2} - ONO, {CH}_{3} - {CH}_{2} - {CH}_{2} - NC$

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Given below are two statements:
Statement I: The conversion proceeds well in the less polar medium.

$C H_{3} - C H_{2} - C H_{2} - C H_{2} - C l \overset{^{H O^{-}}}{\to} C H_{3} - C H_{2} - C H_{2} - C H_{2} - O H + C l^{(-)}$

Statement II: The conversion proceeds well in the more polar medium.

$C H_{3} - C H_{2} - C H_{2} - C H_{2} - C l \overset{R_{3} \overset{. .}{N}}{\to} C H_{3} - C H_{2} - C H_{2} - C H_{2} - N_{\underset{R}{| (+)}}^{\overset{R}{|}} - R C l^{(-)}$

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

[JEE Main 2025, 24 Jan (Shift 1)]

Statement I is true but Statement II is false

Statement I is false but Statement II is true

Both Statement I and Statement II are false

Both Statement I and Statement II are true

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The major product $C$ in the below mentioned reaction is :
$C H_{3} C H_{2} C H_{2} B r \to_{Δ}^{A l c . K O H} A \overset{H B r}{\to} B \to_{∆}^{Aq K O H} C$

[Re-NEET 2024]

Propan-1-ol

Propan-2-ol

Propane

Propyne

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