Compared to the ideal angle, you would expect the actual angle between the bromine-oxygen bonds to be

Smaller

Explanation:

Though, your question is not too clear but base on my understanding, I have the following explanation;

The angle in the bromine-oxygen bonds will be smaller than the ideal angle, say for example, if the ideal angle is 120°, the actual angle of bromine-oxygen bonds will have lesser value because of the absence of lone pairs of electrons from the central atom in the ion. This will tend to squeeze the two single bond that exist before causing lesser angle.

a c d and f

just finished the assignment

1. they vary with a higher number because boiling is way hotter than melting