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a
CH3Cl
b
CCl4
c
Methylene chloride CH2Cl2
d
chloroform CHCl3
answer is B.
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Detailed Solution
i. Dipole moment is vector quantity. When vector sum of all dipoles in molecule will be zero, then molecule will not have net dipole moment.ii. For net dipole moment to be equal to zero, all the atoms attached to central atom must be identical and geometry must be regular. Therefore, carbon tetrachloride having regular geometry and identical atoms attached to bonds has zero dipole moment.