Question

${CH}_{3}COOH$ $\stackrel{{Br}_2/P}{\to }Y\underset{\left(ii\right)H_3{O}^{+}}{\overset{\left(i\right)KCN}{\to }}X$

Here, X is:

• A. glycollic acid
• B. hydroxy propionic acid
• C. succinic acid
• D. malonic acid

Answer 1

The correct option is D malonic acid

When acetic acid undergoes bromination,

$C{H}_{3}COOH\stackrel{{Br}_2/P}{\to }Br-C{H}_{2}COOH$

Further with $KCN$ gives,

$Br-C{H}_{2}COOH\stackrel{KCN(alc.)}{\to }NC-C{H}_{2}COOH$

Finally,

$NC-C{H}_{2}COOH\stackrel{KCN(alc.)}{\to }HOOC-C{H}_2-COOH$ Which is malonic acid.

Option D is correct.