Polysubstitution is drawback of which reaction

Options

A. Reimer tiemann reaction
B. Friedel Craft's alkylation
C. Acetylation of aniline
D. Friedel Craft's acylation

Explanation

To solve the question "Polysubstitution is a drawback of which reaction?", we will analyze the options provided and determine which reaction is prone to polysubstitution.

### Step-by-Step Solution:

1. **Understanding Polysubstitution**:
- Polysubstitution refers to the occurrence of multiple substitutions on a benzene ring. This typically happens when the substituents attached to the benzene ring are activating groups, which increase the electron density on the ring and make it more reactive toward further electrophilic substitution.

2. **Analyzing Each Reaction**:
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