Answer
Please see the work below.
Work Step by Step
a. Trigonal pyramidal and T-shaped and trigonal planar would have a dipole moment of zero.
b. Bent.
Linear would have a dipole moment of zero.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.