BoardChemistry

Haloalkanes and Haloarenes

7 Board Chemistry previous year questions on Haloalkanes and Haloarenes — options free on every question; 1 include the answer & explanation free, the rest unlock with PYQ Pass.

Q1 FREE PREVIEW
PYQ

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

\(A\overset{Ag-N{O}_{2}}{←}C{H}_{3}-C{H}_{2}-C{H}_{2}-Br\overset{AgCN}{\to }B\)

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

a

\(C{H}_{3}-C{H}_{2}-C{H}_{2}-N{O}_{2},C{H}_{3}-C{H}_{2}-C{H}_{2}-CN\)

b

\(C{H}_{3}-C{H}_{2}-C{H}_{2}-ONO,C{H}_{3}-C{H}_{2}-C{H}_{2}-NC\)

c

\(C{H}_{3}-C{H}_{2}-C{H}_{2}-ONO,C{H}_{3}-C{H}_{2}-C{H}_{2}-CN\)

d

\(C{H}_{3}-C{H}_{2}-C{H}_{2}-N{O}_{2},C{H}_{3}-C{H}_{2}-C{H}_{2}-NC\)

✓ Correct answer: d)

\(C{H}_{3}-C{H}_{2}-C{H}_{2}-N{O}_{2},C{H}_{3}-C{H}_{2}-C{H}_{2}-NC\)

Explanation

AgCN is covalent compound and \(AgN{O}_{2}\) is ionic compound.
A is \(C{H}_{3}-C{H}_{2}-C{H}_{2}-N{O}_{2},B\) is \(C{H}_{3}-C{H}_{2}-C{H}_{2}-NC\).

Q2
PYQ

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

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

a

Racemisation occurs in\({S}_{N}1\) reaction and inversion occurs in \({S}_{N}2\) reaction.

b

Racemisation occurs in \({S}_{N}1\) reaction and retention occurs in \({S}_{N}2\)reaction.

c

Retention occurs in \({S}_{N}1\) reaction and inversion occurs in \({S}_{N}2\) reaction

d

Racemisation occurs in both \({S}_{N}1\) and \({S}_{N}2\) reactions

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Q3
PYQ

Identify correct statement/s :

(A) \(-OC{H}_{3}\) and \(-NHCOC{H}_{3}\) 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

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

b

(A) and (C) only

c

(A) only

d

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

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Q4
PYQ

The products A and B in the following reactions, respectively

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

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

a

\({\mathrm{CH}}_{3}-{\mathrm{CH}}_{2}-{\mathrm{CH}}_{2}-\mathrm{ONO},{\mathrm{CH}}_{3}-{\mathrm{CH}}_{2}-{\mathrm{CH}}_{2}-\mathrm{CN}\)

b

\({\mathrm{CH}}_{3}-{\mathrm{CH}}_{2}-{\mathrm{CH}}_{2}-{\mathrm{NO}}_{2},{\mathrm{CH}}_{3}-{\mathrm{CH}}_{2}-{\mathrm{CH}}_{2}-\mathrm{NC}\)

c

\({\mathrm{CH}}_{3}-{\mathrm{CH}}_{2}-{\mathrm{CH}}_{2}-{\mathrm{NO}}_{2},{\mathrm{CH}}_{3}-{\mathrm{CH}}_{2}-{\mathrm{CH}}_{2}-\mathrm{CN}\)

d

\({\mathrm{CH}}_{3}-{\mathrm{CH}}_{2}-{\mathrm{CH}}_{2}-\mathrm{ONO},{\mathrm{CH}}_{3}-{\mathrm{CH}}_{2}-{\mathrm{CH}}_{2}-\mathrm{NC}\)

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Q5
PYQ

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

\(C{H}_{3}-C{H}_{2}-C{H}_{2}-C{H}_{2}-Cl\overset{{}^{H{O}^{-}}}{\to }C{H}_{3}-C{H}_{2}-C{H}_{2}-C{H}_{2}-OH+C{l}^{(-)}\)

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

\(C{H}_{3}-C{H}_{2}-C{H}_{2}-C{H}_{2}-Cl\overset{{R}_{3}\overset{..}{N}}{\to }C{H}_{3}-C{H}_{2}-C{H}_{2}-C{H}_{2}-\overset{\overset{R}{|}}{\underset{\underset{R}{|(+)}}{N}}-RC{l}^{(-)}\)

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

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

a

Statement I is true but Statement II is false

b

Statement I is false but Statement II is true

c

Both Statement I and Statement II are false

d

Both Statement I and Statement II are true

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Q6
PYQ

The major product \(C\) in the below mentioned reaction is :
\(C{H}_{3}C{H}_{2}C{H}_{2}Br\overset{Alc.KOH}{\underset{\Delta }{\to }}A\overset{HBr}{\to }B\overset{\text{Aq  }KOH}{\underset{∆}{\to }}C\)

[Re-NEET 2024]

a

Propan-1-ol

b

Propan-2-ol

c

Propane

d

Propyne

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Q7
PYQ

Which of the following alkyl halides is hydrolysed by \({{S}_{N}}^{I}\) mechanism?

a

\({\left({\mathrm{CH}}_{3}\right)}_{2}\mathrm{CHX}\)

b

\({\mathrm{CH}}_{3}{\mathrm{CH}}_{2}\mathrm{X}\)

c

\({\mathrm{CH}}_{3}{\mathrm{CH}}_{2}{\mathrm{CH}}_{2}\mathrm{X}\)

d

\({\left({\mathrm{CH}}_{3}\right)}_{3}\mathrm{CX}\)

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