Question:
In the following reaction, the major product (H) is
In the following reaction, the major product (H) is
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Grignard tips:
Always attacks carbonyl first
Intramolecular cyclization possible
Workup gives alcohol/ether products
Updated On: Mar 2, 2026
- Option a
- Option b
- Option c
- Option d
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Concept:
Grignard reagents:
Attack electrophilic carbonyl carbon
Also react with alkyl halides intramolecularly if possible
Step 1: Functional groups
Molecule contains:
Ketone
Alkyl chloride in same chain
Step 2: Reaction pathway
MeMgBr first forms alkoxide via addition to ketone.
Intramolecular nucleophilic substitution occurs forming cyclic ether.
Step 3: After hydrolysis
Protonation gives cyclic ether with allylic side chain.
Conclusion:
Structure corresponding to option (D) forms.
Grignard reagents:
Attack electrophilic carbonyl carbon
Also react with alkyl halides intramolecularly if possible
Step 1: Functional groups
Molecule contains:
Ketone
Alkyl chloride in same chain
Step 2: Reaction pathway
MeMgBr first forms alkoxide via addition to ketone.
Intramolecular nucleophilic substitution occurs forming cyclic ether.
Step 3: After hydrolysis
Protonation gives cyclic ether with allylic side chain.
Conclusion:
Structure corresponding to option (D) forms.
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