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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3g1150

Which of the following statements about the number of hyperconjugative structures are correct?

APropene, $CH X_{3} CH = CH X_{2}$ , has 3.
B2-Methylbut-2-ene, $(CH X_{3}) X_{2} C = CHCH X_{3}$ , has 9.
CBut-2-ene, $CH X_{3} CH = CHCH X_{3}$ , has 6.
D2-Methylpropene, $(CH X_{3}) X_{2} C = CH X_{2}$ , has 3.

Answer: A, B, C

The count equals the alpha hydrogens. Propene 3; 2-methylbut-2-ene

3 + 3 + 3 = 9

; but-2-ene

3 + 3 = 6

; 2-methylpropene has two methyls, so 6, not 3. Hence statements 1, 2 and 3 are correct.

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