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

$(A)\;H_3C - C = C - CH_3 \\ (B)\;CH_3C \equiv CCH_3 \\(C)\;CH_3CH_2C \equiv CH \\(D)\;CH_2 = CH_3 - C \equiv CH$

It is symmetrical with linear structure and therefore , will have zero dipole moment.
Hence b is the correct answer.