Presence of – `NH_2` group in benzene ring activates the ring for further substitution reaction, explain why ?

Which one undergoes S_(N)2 substitution reaction faster and why?

Nitration of benzene is an electrophilic substitution reaction. Why ?

Account for the following : (a) Alkyl halides prefer to undergo dehydrohalogenation in the presence of a strong base such as Na metal instead of undergoing Wurtz reaction. (b) Allyl chloride is more reactive than the n-propyl chloride towards nucleophilic substitution reaction. Explain why?

Explain, why. alkyl halides undergo nucleophilic substitution reaction?

Explain how the alkoxy group (-OR) is ortho and para-directing and activates the aromatic ring towards electrophilic substitution reactions.

Explain why anisole does not undergo nucleophilic substitution reactions ?

Why is NH_(2) group of aniline acetylated before carrying out nitration ?

Why chlorobenzene is less reactive than alkyl chloride towards nuclecphilic substitution reaction?