Which of the following statements is not correct?

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Replacement of halogen by ${NH}_{2}$ in alkyl halide is a nucleophilic substitution reaction

Ary! halides show more reactivity as compared to alkyl halides in the replacements of halogen by the ${NH}_{2}$ group

During the replacement of halogen by $- {NH}_{2}$ group, ammonia is taken in large excess so as to avoid the

Tertiary alkyl halide generally produces alkene instead of the replacement of halogen by ${NH}_{2}$ group

answer is B.

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Detailed Solution

Aryl halides is less reactive than alkyl halide. Halogens are not easily substituted in aryl halides.
This is because conjugation with the benzene ring involves the lone pair of electrons on the halogen atom. Consequently, a partial double bond character emerges in the C-X bond. Therefore, it is highly challenging to dissolve this partial double bond.
As a result, substitution reaction does not happen readily in aryl halides.
For this, extreme circumstances are necessary.

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