**Benzylamine reacts with nitrous acid to form benzyl alcohol**

**Explanation:**

When benzylamine (C6H5CH2NH2) reacts with nitrous acid (HNO2), it undergoes a process known as diazotization. This reaction involves the formation of a diazonium salt intermediate, which can then undergo further reactions.

The reaction between benzylamine and nitrous acid can be summarized as follows:

C6H5CH2NH2 + HNO2 → C6H5CH2OH + N2 + H2O

Let's break down the reaction steps:

**Step 1: Formation of Diazonium Salt**

In the presence of nitrous acid, the amine group (NH2) of benzylamine is protonated to form a positively charged ammonium ion (NH3+). The nitrous acid then reacts with the ammonium ion, resulting in the formation of a diazonium salt.

C6H5CH2NH2 + HNO2 → C6H5CH2NH3+ + NO2-

**Step 2: Rearrangement of Diazonium Salt**

The diazonium salt formed in step 1 undergoes rearrangement to produce a carbocation intermediate. In this case, the rearrangement involves migration of the benzyl group (C6H5CH2) to the nitrogen atom.

C6H5CH2NH3+ + NO2- → C6H5CH2+ + N2 + H2O

**Step 3: Formation of Benzyl Alcohol**

The carbocation intermediate formed in step 2 can react with water (H2O) to form the desired product, benzyl alcohol (C6H5CH2OH). The water molecule acts as a nucleophile, attacking the carbocation and displacing the positively charged benzyl group.

C6H5CH2+ + H2O → C6H5CH2OH

Therefore, the overall reaction between benzylamine and nitrous acid results in the formation of benzyl alcohol, along with the evolution of nitrogen gas (N2) and water (H2O).

##benzyl amine with nitrous acid first forms an unstable diazonium salt... which in turn gives the alcoho with the evolution of nitrrogen gas...