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Consider the above reaction sequence and identify the product B. A di-Grignard reagent reacts with CH3 – C(=O) – CH2 – C(=O) – CH3 and then on hydrolysis gives the major product B.

1. A cyclopentane derivative with two OH groups and one CH3 substituent as shown in option (1)
2. A cyclohexane derivative with OH groups at top and bottom positions as shown in option (2)
3. A cyclopentane derivative with three OH groups and two CH3 substituents as shown in option (3)
4. A cyclopentane derivative with two carbonyl groups and two CH3 substituents as shown in option (4)

Correct answer: A cyclopentane derivative with two OH groups and one CH3 substituent as shown in option (1)

Solution

The correct option describes a cyclopentane derivative that results from the reaction of the di-Grignard reagent with the diketone, leading to the formation of a compound with two hydroxyl groups and one methyl substituent after hydrolysis, which aligns with the expected reactivity and product structure.

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