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NEET levelSingle correct optionDifficulty 1 of 3g1114

Which of the following alkenes has the maximum number of hyperconjugative structures?

A $CH X_{3} CH X_{2} - CH = CH X_{2}$ (but-1-ene)
B $CH X_{2} = CH X_{2}$ (ethene)
C $(CH X_{3}) X_{2} C = CH X_{2}$ (2-methylpropene)
D $CH X_{3} - CH = CH X_{2}$ (propene)

Answer: C

Count alpha C-H bonds: 2-methylpropene has

2 \times 3 = 6

, propene 3, but-1-ene 2 (the

CH X_{2}

) and ethene 0. So 2-methylpropene has the most.

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