15 which of the following reaction is/ are possible : (a) ch,ch ch,ch kcn (b) ch-ch-c ch-ch cn f.c nli (c) ch,ch-a. fĆ -ch,ch, oh ch, hbr (d)

Reactions possible are a and d. Reason for b being incorrect is attached as image. In C, since strong base is there, acid base reaction will be preffered over nucleophilic substitu...