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JEE Main levelNumerical answerDifficulty 2 of 3g1176

Consider the carbocation $(CH X_{3}) X_{2} CH - CH X_{2} - C X^{+} (CH X_{3}) - CH X_{2} CH X_{3}$ . The number of hyperconjugative structures equals the number of alpha hydrogens, i.e. hydrogens on the sp3 carbons directly attached to the cationic carbon. Find the number of hyperconjugative structures.

Numerical answer type, tolerance 0.5.

Answer: 7

The cationic carbon is attached to three sp3 carbons:

CH X_{3}

(3 H), the

CH X_{2}

of the ethyl group (2 H) and the

CH X_{2}

of the isobutyl group (2 H). The isopropyl CH hydrogen is beta and is not counted. Total = 3 + 2 + 2 = 7.

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