Correct set of species which have zero dipole moment
CO2−BCl3
COCl2−BCl3
CH2Cl2−BCl3
CO2−CH2Cl2−BCl3
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Solution
The correct option is ACO2−BCl3 CO2 is linear and CCl4 is trigonal planar hence net polarity of both molecules is zero. On the other hand, COCl2 and CH2Cl2 are polar molecules and hence will have a non-zero dipole moment.