The acid D obtained through the following sequence of reactions is:
`C_(2)H_(5)Br overset(Alc. KOH)rarrA overset(Br_(2))underset(C Cl_(4))rarrBoverset(KCN)underset((excees))rarrCoverset(H_(3)O^(+))rarr`

Options

A. Succinic acid
B. Malonic acid
C. Maleic acid
D. Oxalic acid

Answer

A

Explanation

`C_(2)H_(5)Br overset(Alc.KOH)(rarr) CH_(2) = CH_(2) underset(C Cl_(4))overset(Br_(2))(rarr) underset(Br) underset(|)(CH_(2)) - overset(Br)overset(|)(CH_(2)) underset(("excess"))overset(KCN)(rarr) underset(CN)underset(|)(CH_(2)) - overset(CN)overset(|)(CH_(2)) overset(H_(3)O^(+))(rarr) underset(COOH)underset(|)(CH_(2)) - CH_(2) - COOH`