Question

Aldehyde or ketones when treated with C₆H₅ - NH - NH₂, the product formed is ______.

Options

• semicarbazone 

• phenyl hydrazone 

• hydrazone 

• oxime

Answer 1

Aldehyde or ketones when treated with C₆H₅ - NH - NH₂, the product formed is phenyl hydrazone.

Explanation:

Aldehydes or ketones on treatment C₆H₅ - NH - NH₂ (phenylhydrazine) gives phenylhydrazone. This is a nucleophilic addition reaction.

\[\begin{array}{cc}
\ce{R}\phantom{..................................}\ce{R}\phantom{......................}\\
\backslash\phantom{..................................}\backslash\phantom{...................}\\
\ce{\underset{Aldehyde}{C} = O + H2N - NH - C6H5 -> C = N - NH - C6H5}\\
/\phantom{..................................}/\phantom{...................}\\
\ce{H}\phantom{..................................}\ce{H}\phantom{......................}\end{array}\]

 

\[\begin{array}{cc}
\ce{R}\phantom{..................................}\ce{R}\phantom{......................}\\
\backslash\phantom{..................................}\backslash\phantom{...................}\\
\ce{\underset{Ketone}{C} = O + H2N - NH - C6H5 -> \underset{Phenyl hydrazone}{C = N - NH -} C6H5}\\
/\phantom{..................................}/\phantom{...................}\\
\ce{H}\phantom{..................................}\ce{H}\phantom{......................}\end{array}\]