NA (nucleophilic addition) reaction of alcohols with aldehydes gives hemiacetal, whereas phenols react with aldehydes and ketones in acidic medium and give electrophilic substitution product. True/False

Explanation

To determine whether the statement is true or false, we need to analyze the two parts of the statement regarding the reactions of alcohols and phenols with aldehydes and ketones.

### Step-by-Step Solution:

1. **Understanding Alcohols and Aldehydes:**
- Alcohols (R-OH) can react with aldehydes (R'-CHO) through a nucleophilic addition mechanism.
- In this reaction, the oxygen atom of the alcohol, which has lone pairs of electrons, acts as a nucleophile and attacks the electrophilic carbon of the carbonyl group (C=O) in the aldehyde.
- This leads to the formation of a hemiacetal (R-CHOH-R').
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