The carbylamine reaction is a chemical test used to distinguish primary amines from secondary and tertiary amines. In this reaction, the primary amine reacts with chloroform (CHCl3) and alcoholic potassium hydroxide (KOH) to form an isocyanide (also known as carbylamine). The isocyanide has a foul smell, resembling that of rotten fish.

To understand why (CH3)2NH will not respond to the carbylamine reaction, we need to examine the reaction mechanism and the structure of the amine.

Explanation:
The carbylamine reaction proceeds through the following steps:

1. The primary amine reacts with chloroform (CHCl3) in the presence of alcoholic potassium hydroxide (KOH) to form an intermediate called dichlorocarbene.
2. The dichlorocarbene reacts with excess amine to form the carbylamine.

Now, let's look at the structure of (CH3)2NH (dimethylamine) and understand why it will not respond to the carbylamine reaction.

(CH3)2NH is a secondary amine, meaning it has two alkyl groups attached to the nitrogen atom. In the carbylamine reaction, the chloroform reacts with the amine to form an intermediate dichlorocarbene. The dichlorocarbene then reacts with an excess of amine to form the carbylamine.

In the case of (CH3)2NH, the nitrogen atom is already bonded to two methyl groups. Hence, there is no hydrogen atom available on the nitrogen atom for the reaction to occur. Without a hydrogen atom, the dichlorocarbene cannot form, and the carbylamine reaction cannot proceed.

On the other hand, primary amines like ethylamine (CH3CH2NH2) and phenylamine (C6H5NH2) have a hydrogen atom attached to the nitrogen atom. This hydrogen atom can react with the dichlorocarbene intermediate, allowing the carbylamine reaction to take place.

In summary, (CH3)2NH will not respond to the carbylamine reaction because it is a secondary amine and does not have a hydrogen atom available on the nitrogen atom for the reaction to occur.

Carbylamine reaction is for primary aliphatic and aromatic amine.