Question

For distinction between \[\ce{CH3CHO}\] and \[\ce{C6H5CHO}\] the reagent used is ______.

Options

• KCN

• HCN

• \[\ce{NH2OH}\]

• \[\ce{PCl5}\]

Answer 1

For distinction between \[\ce{CH3CHO}\] and \[\ce{C6H5CHO}\] the reagent used is KCN.

Explanation:

Acetaldehyde react with KCN to form acetaldehyde cynohydrine.

\[\begin{array}{cc}
\ce{CH3 - CHO ->[KCN][HCl] CH3 - C - CN.}\\ \phantom{..................}|\\\phantom{....................}\ce{OH}
\end{array}\]

While Benzaldehyde react with KCN to form Benzoin.