Chlorobenzene can be prepared by reacting aniline with

(a) nitrous acid followed by heating with cuprous chloride

(b) chlorine in presence of anhydrous aluminium chloride

(c) cuprous chloride

(d) hydrochloric acid

When propyne is treated with aqueous H₂SO₄ presence of H₂SO₄ the major product is

(1) acetone

(2) propanol

(3) propanal

(4) propyl hydrogen sulphate