Assertion (A) $-\mathrm{NH}_2$ group of aniline is ortho, para directing in electrophilic substitutions.…
Assertion (A) $-\mathrm{NH}_2$ group of aniline is ortho, para directing in electrophilic substitutions.
Reason (R) $-\mathrm{NH}_2$ group stabilises the arenium ion formed by the ortho, para attack of the electrophile.
The correct answer is
Both $(A)$ and $(R)$ are correct, $(R)$ is the correct explanation of $(A)$
Both $(\mathrm{A})$ and $(\mathrm{R})$ are correct, $(\mathrm{R})$ is not the correct explanation of $(\mathrm{A})$
(A) is correct, but (R) is not correct
(A) is not correct, but (R) is correct
Solution
The $-\mathrm{NH}_2$ group of aniline is a very strong electron donor (+ $M$ effect), hence it activates the benzene ring thoroughly and the electrophilic aromatic substitutions on the benzene ring are very easy to take place at ortho and para-positions.
