Which one has minimum (nearly zero) dipole moment [IIT Screening 1

1.	Which one has minimum (nearly zero) dipole moment [IIT Screening 1994; CBSE PMT 1996]
A.	Butene-1
B.	cis butene-2
C.	trans butene-2
D.	2-methyl-1-propene
Answer» D. 2-methyl-1-propene

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Which one has minimum (nearly zero) dipole moment [IIT Screening 1994; CBSE PMT 1996]

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