JEE Main Chemistry question

The only molecule having a dipole moment is

(A)2,2-dimethylpropane
(B)-2-penteneCorrect
(C)-3-hexene
(D)2,2,3,3-tetramethylbutane

Answer: (B)

Solution

2,2-dimethylpropane and 2,2,3,3-tetramethylbutane are saturated, symmetric alkanes with no multiple bonds and effectively zero net dipole moment. -3-hexene (CH_3CH_2-CH=CH-CH_2CH_3) has identical ethyl groups on both alkene carbons, so the group dipoles cancel

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Question ID VK-155931