Ans is c
dihalides are boiled with aqueous KOH or NaOH. It produces aldehydes and
ketones. geminal dihalide (R-CHX2) having two halogen
atoms situated on terminal carbon atom, are hydrolysed by aq. KOH or aq. NaOH
first produced a unstable dihydroxy compound. Then converts into an aldehyde by
loss of water molecule.
1-1- dichloroethane is germinal dihalide which react with KOH and produce unstable hydroxyl compound
then loss of water molecule acetaldehyde produce
attachment for reaction.