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# Which of the following has zero dipole moment ?

$(a)\;Cis - 2- Butene \\(b)\;trans-2-Butene \\(c)\;1-Butene \\(d)\;2-methyl-1-propane$

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A)
In the trans isomers, the two dipoles act in the opposite directions and cancels each other.
Hence b is the correct answer.