What is vapour phase nitration ?

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Vapor Phase Nitration:**
Vapor phase nitration is a chemical process used to introduce a nitro group (-NO2) into a hydrocarbon, typically lower alkanes, by reacting them with nitric acid in the vapor phase.

2. **Conditions Required:**
This process requires the heating of a gaseous mixture of the hydrocarbon (alkane) and nitric acid. The reaction occurs at high temperatures, specifically between 673 to 773 Kelvin.

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