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The number of hyper conjugation structures involved to stabilize carbocation formed in the above reaction is _____.

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answer is 7.

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Detailed Solution

Hyperconjugation Structures for Major Carbocation

The tertiary carbocation formed after reaction with HBr is stabilized by hyperconjugation from the six hydrogens directly attached to carbons adjacent to the carbocation center.

Number of hyperconjugation structures = 6

Reasoning

Identify α-hydrogens on methyl and ring carbons adjacent to the cation
Total α-hydrogens = 6
Thus, 6 hyperconjugation (no-bond resonance) structures are possible

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