(c)
$SnCI_{2} + 2HCI(g) \rightarrow SnCI_{4} + 2\lbrack H\rbrack$
$CH_{3}CN + 2\lbrack H\rbrack + HCI \rightarrow CH_{3}CH = NH.HCI\underset{boil}{\overset{H_{2}O}{\rightarrow}}CH_{3}CHO + NH_{4}CI$
(X ) (Y )
(X ) is acetaldimine hydrochloride and (Y ) is acetaldehyde.