Which of the following molecule(s) has/have zero dipole moment ?

C H_{4}

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C B r_{4}

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C_{2} H_{2}

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None of these

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Solution

The correct options are
A $C H_{4}$
B $C B r_{4}$
C $C_{2} H_{2}$
All the three molecules methane, carbon tetrabromide and acetylene have zero dipole moments as the individual bond dipoles cancel each other which result in zero net dipole moments.

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