Choose the one compound within each set the meets the indicated criterion :

Answer

a-p ; b-r ; c-s; d-s

Explanation

(a) Substitution takes place in only compound (1). In compound (4), HBr will be eliminated hence elimination reaction, not substitution. Hence.compound·(1).
(b) Williamson ethersynthesis `rArr` substitutioncan nottake place onbenzenehence compound
(3). (c) Aq. ethanolwill substitute `Br^-` with `EtO^-` and `H^+` ions released inthesolution turning the solution acidic in compound
(4) Hence compound (4).
(d) In compound (3), after cleavage, positive charge will be.on benzene ring which is highly unstable. Hence compound (2).