Give the reaction of $(a)$ acetaldehyde and $(b)$ acetone with $(i)$ $NaHSO_{3}$ and $(ii)$ $HCN$.

(N/A) $(i)$ Reaction of acetaldehyde with $NaHSO_{3}$:
$CH_{3}CHO + NaHSO_{3} \rightarrow CH_{3}CH(OH)SO_{3}Na$ (Acetaldehyde sodium bisulphite addition product)
$(a)$ $(ii)$ Reaction of acetaldehyde with $HCN$:
$CH_{3}CHO + HCN \rightarrow CH_{3}CH(OH)CN$ (Acetaldehyde cyanohydrin)
$(b)$ $(i)$ Reaction of acetone with $NaHSO_{3}$:
$CH_{3}COCH_{3} + NaHSO_{3} \rightarrow CH_{3}C(OH)(SO_{3}Na)CH_{3}$ (Acetone sodium bisulphite addition product)
$(b)$ $(ii)$ Reaction of acetone with $HCN$:
$CH_{3}COCH_{3} + HCN \rightarrow CH_{3}C(OH)(CN)CH_{3}$ (Acetone cyanohydrin)