Acyl halides are prepared by the action of _____on carboxylic acids.

Explanation

To answer the question, "Acyl halides are prepared by the action of _____ on carboxylic acids," we can follow these steps:

### Step 1: Identify the reactants
We start with carboxylic acids, which have the general formula RCOOH, where R is an alkyl or aryl group.

### Step 2: Identify the reagents used to convert carboxylic acids to acyl halides
Acyl halides can be synthesized from carboxylic acids using different reagents. Common reagents include:
- Thionyl chloride (SOCl2)
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