(A) `p-O_(2)N-C_(6)H_(4)COCH_(3)` is prepared by Friedel Crafts
acylation of nitrobenzene.
(R) Nitrobenzene easily undergoes electrophilic substitution
reaction.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false

Explanation

To solve the question, we need to analyze the two statements provided: the assertion and the reason.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that `p-O2N-C6H4COCH3` (which is para-nitroacetophenone) is prepared by Friedel-Crafts acylation of nitrobenzene.
- Friedel-Crafts acylation involves the introduction of an acyl group (RCO-) into an aromatic ring using an acyl chloride and a Lewis acid catalyst (like AlCl3).

2. **Analyzing the Reaction**:
- Nitrobenzene (C6H5NO2) is the starting material in this reaction.
- The Friedel-Crafts acylation would typically yield a product where the acyl group is added to the aromatic ring. However, the position of substitution is crucial.

3. **Position of Substitution**:
- The nitro group (NO2) is an electron-withdrawing group. This means it decreases the electron density of the aromatic ring.
- Due to the electron-withdrawing nature of the nitro group, the acylation is more likely to occur at the meta position rather than the para position.

4. **Conclusion on Assertion**:
- Since the assertion claims that the product is para-nitroacetophenone, and we established that the reaction would favor meta substitution due to the electron-withdrawing effect of the nitro group, the assertion is **false**.

5. **Understanding the Reason**:
- The reason states that nitrobenzene easily undergoes electrophilic substitution reactions.
- However, because the nitro group is electron-withdrawing, it makes the aromatic ring less reactive towards electrophilic substitution.

6. **Conclusion on Reason**:
- Therefore, the reason is also **false** because the presence of the nitro group actually inhibits electrophilic substitution rather than facilitating it.

### Final Answer:
Both the assertion and the reason are false.

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