Chemistry related

Question

Which molecule is polar?

(A) BF3

(B) CO2

(C) CF4

(D) H2S

could you explain which answer you got and why?

Answer 1

The only polar molecule in the list is H₂S. When considering molecular polarity look for lack of symmetry. In going down the list you have, BF₃ is triangular planer and is symmetrical; CO₂ is linear & symmetrical; CF₄ is tetrahedral & symmetrical. But H₂S has a 'bent' structure (of ~92^o). Hence it's asymmetric & therefore polar.