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Q. Which of the following reaction is given by both, formaldehyde and acetaldehyde?

Aldehydes Ketones and Carboxylic Acids

Solution:

Formaldehyde and Acetaldehyde both will give oxime when treated with $NH _{2} OH$.
$H - \overset{\underset{|}{H}}{C} = O + NH _{2} OH \rightarrow H -\overset{\underset{|}{H}}{C} = N - OH + H _{2} O$
$CH _{3}- \overset{\underset{|}{H}}{C} = O + NH _{2} OH \rightarrow CH _{3}- \overset{\underset{|}{H}}{C} = NOH + H _{2} O$