A : Grignard reagent on reaction with alcohol form alkane.
R : Alcohol has acidic (active) hydrogen.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
C. if Assertion is true statement but Reason is false, then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To solve the assertion-reason question, we will analyze both the assertion (A) and the reason (R) step by step.

### Step 1: Analyze the Assertion (A)
**Assertion (A): Grignard reagent on reaction with alcohol forms alkane.**

- Grignard reagents are organometallic compounds represented as R-Mg-X, where R is an organic group, Mg is magnesium, and X is a halogen.
- When Grignard reagents react with alcohols (R-OH), they undergo a reaction where the alkoxide ion (R-O⁻) is formed, and the hydrogen from the alcohol is replaced by the R group from the Grignard reagent.
- This reaction results in the formation of an alkane (R-H) and a magnesium alkoxide (R-O-MgX).

**Conclusion for Assertion (A): True.**

### Step 2: Analyze the Reason (R)
**Reason (R): Alcohol has acidic (active) hydrogen.**

- Alcohols contain a hydroxyl group (-OH), where the hydrogen atom is somewhat acidic due to the electronegativity of the oxygen atom.
- This means that the hydrogen atom can be released as a proton (H⁺) in the presence of a strong base or reactive species, such as Grignard reagents.
- The presence of this acidic hydrogen is what allows the Grignard reagent to react with the alcohol, leading to the formation of an alkane.

**Conclusion for Reason (R): True.**

### Step 3: Determine the Relationship between A and R
Now we need to determine if the reason (R) is the correct explanation for the assertion (A).

- The assertion states that Grignard reagents react with alcohols to form alkanes.
- The reason explains that alcohols have acidic hydrogen, which is indeed the reason why Grignard reagents can react with them.
- Therefore, the reason provided does correctly explain the assertion.

### Final Conclusion
- Both the assertion (A) and the reason (R) are true, and the reason is the correct explanation for the assertion.

### Summary
- A: True
- R: True
- R explains A.

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