1. Which of the following statements will explain why the surface tension of CHBr3 is greater than CHCl₃?

A. CHBr₃ has a higher molar mass, more polarizable thus stronger dispersion forces.

B. CHCl₃ exhibits dipole- dipole force thus lesser surface tension.

C. CHBr₃ is less polarizable thus stronger dispersion force.

D. Chlorine is more electronegative than bromine thus CHBr₃ has stronger H-bond than CHCl₃.

2. Why butane has a higher boiling point than 2-methylpropane, whose space-filling models are shown?

 

(a) Butane (b) 2-Methylpropane