A compound (A) with molecular formula C_4 H_5 N on reduction with DIBAL-H followed by hydrolysis, gives a compound (B). Compound (B) gives positive…

A compound (A) with molecular formula $\displaystyle \mathrm{C}_{4} \mathrm{H}_{5} \mathrm{~N}$ on reduction with DIBAL-H followed by hydrolysis, gives a compound (B). Compound (B) gives positive Tollens' test but does not give iodoform test. Compound (B) can also be obtained when ethanal is treated with dilute NaOH followed by heating. Identify (A) and (B). Write the reactions of (A) with DIBAL-H followed by hydrolysis.