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Question

Which of the following is least reactive towards hydrogenation?

A
CH3CCCH3
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B
CH3CCH
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C
HCCH
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D
H2C=CH2
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Solution

The correct option is D H2C=CH2
Alkenes are less reactive than alkynes towards hydrogenation because alkynes are less sterically hindered in comparison to alkenes. Hence, the correct option will be option (d).

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