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Which one of the following alkenes will react faster with H2 under catalytic hydrogenation conditions? (R = Alkyl Substituent)

1. CH3 − CH = CH − CH3
2. CH3 − CH = CH2
3. CH2 = CH − CH2 − CH3
4. CH3 − CH2 − CH = CH2

Correct answer: CH3 − CH = CH2

Solution

The alkene CH3 − CH = CH2 (option B) is less substituted compared to the others, making it more reactive towards catalytic hydrogenation due to lower steric hindrance around the double bond.

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