question_answer

The zero dipole moment is shown by:

A) \[cis-\]1, 2-dichloroethylene

B) trans-1, 2- dichloroethylene

C) 1, 1- dichloroethylene

D) none of the above

Correct Answer: B

Solution :

Key Idea: Dipole moment is a vector quantity. The molecules having symmetrical structure have zero dipole moment. (a)                                                          (b)                         (c) \[\because \] Out of given choices, only irons 1, 2-dichloro ethylene is symmetrical. \[\therefore \] It has zero dipole moment.