First slide

Organic reagents and intermediates

Question

Among 1-pentene, cis-2-pentene and trans-2-pentene the correct order of stability is

Moderate

A

1-pentene > cis-2-pentene > trans-2-pentene
B

1-pentene > cis-2-pentene < trans-2-pentene
C

1-pentene < cis-2-pentene > trans-2-pentene
D

1-pentene < cis-2-pentene < trans-2-pentene

Solution

In cis-isomers two alkyl groups on same side of the $π$ plane create more steric hindrance, so trans-isomers is more stable than cis.
Hence, the correct answer is (4).

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