A : Nitration of aniline can only be done by protecting $- N H_{2}$ group through acetylation.
R : Acetylation of aniline results in the increase of electron density at the benzene ring.

If both Assertion and the Reason are true and the Reason is a correct explanation of the Assertion.

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If both the Assertion and the Reason are true but the Reason is not a correct explanation of the Assertion.

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If the Assertion is true but the Reason is false.

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If both the Assertion and the Reason are false.

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Solution

The correct option is C If the Assertion is true but the Reason is false.
In the above reaction, $N H_{2}$ group is protected by an acetyl group because the $N H_{2}$ group is highly reactive due to the presence of a lone pair on the nitrogen of aniline and the incoming $N O_{2}$ has a tendency to accept the lone pair effectively.
So, acetylation of $N H_{2}$ group is done to make it less reactive for the incoming $N O_{2}$ group.

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Similar questions

A : Nitration of aniline can only be done by protecting $- N H_{2}$ group through acetylation.
R : Acetylation of aniline results in the increase of electron density at the benzene ring.

Q. In aniline, the lone pair of electrons on the

N

atom is delocalised over the benzene ring. As a result, the electron density on nitrogen increases.

Q. Assertion :

p K b

of aniline is more than that of methylamine. Reason: In aniline, the lone pair of electrons on the

N

atom is delocalized over the benzene ring. As a result, the electron density of nitrogen decreases. In contrast, in

{C H}_{3} {N H}_{2} (+ I)

effect of

{C H}_{3}

increases the electron density on the

N

atom. Therefore, aniline is a weaker base than methylamine and hence its

p K_{b}

value is higher than that of methylamine.

Q. Give reasons for the following:
(a) Acetylation of aniline reduces its activation effect.
(b)

C H_{3} N H_{2}

is more basic than

C_{6} H_{5} N H_{2}

N H_{2}

is O/P directing group,
yet aniline on nitration gives a significant amount of m - nitroaniline.

Q. Why does acetylation of

- N H_{2}

group of aniline reduce its activity ?

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A : Nitration of aniline can only be done by protecting −NH2 group through acetylation. R : Acetylation of aniline results in the increase of electron density at the benzene ring.

A : Nitration of aniline can only be done by protecting $- N H_{2}$ group through acetylation.
R : Acetylation of aniline results in the increase of electron density at the benzene ring.