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# Which of the following hydrocarbons has the lowest dipole moment?

$\begin{array}{1 1}a \\ b \\ c \\ d\end{array}$

$CH_3 - C \equiv C - CH_3$.
It is linear and symmetrical so it has the lower dipole moment.
So correct answer is $CH_3 C \equiv CCH_3$
Hence b is the correct answer.