Which major product is formed in the reaction `RCONH_2 underset("Heat")overset(P_2 O_5)to`

Explanation

To solve the question, we need to analyze the reaction of an amide (RCONH2) when treated with phosphorus pentoxide (P2O5) under heat. Here’s a step-by-step breakdown of the process:

### Step 1: Identify the Reactant
The reactant in this case is an amide, which is represented as RCONH2. The "R" represents a hydrocarbon group, and the functional group is the amide (-C(=O)NH2).

**Hint:** Look for the functional groups present in the compound to identify the type of reaction.

### Step 2: Understand the Role of P2O5
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