Question

How many structural isomers are possible for the molecular formula, $C_5{H}_{13}N$ which gives a positive carbylamine test?

Answer 1

Only primary amines give positive carbylamine test.
Since the degree of unsaturation is zero so unsaturation is absent. There are 8 isomers possible for $C_5{H}_{13}N$ having primary amine as a functional group.

carbylamine test.

• The Carbylamine reaction mechanism includes the addition of an amine to the intermediate created from the dehydrohalogenation of chloroform.
• This intermediate is called dichlorocarbene.
• The carbylamine reaction is also known as Hofmann isocyanide synthesis.
• It is the reaction of a primary amine, chloroform, and a base to synthesize isocyanides.
• The dichlorocarbene intermediate is very important for this conversion.
• The carbylamine reaction cannot be used to synthesize isocyanides from secondary or tertiary amines.
• In general, the carbylamine reaction can be written as: $R-N{H}_2+CHC{l}_3+KOH⟶RNC\left(carbylamine\right)+3KCl+3H_{2}O$