Bond angle betwee C-C in alkyne

If vec A =vec B- vec C , then determine the angle betwee vec A and vec B .

What is the bond angle of C-N-C in trimethyl amine ?

The angle betwee the incident ray and reflected ray is 120^@ in case of a plane mirror. The angle of reflection is

The bond angle in C-O-H alcohol Is slightly less than tetrahedral angle:- Give the reason for the difference in the bond angle observed in alcohol.

Bond angle in alkene (C_2H_4) in equal to