P and Q are two compounds with closely similar $M_r$ values. In P, the molecules attract one another through hydrogen bonding. In Q, the molecules attract one another by van der Waals’ forces alone. A sample of liquid P is compared with a sample of liquid Q. In what ways will their properties be different?
- A1, 2 and 3
- B1 and 2 only
- C2 and 3 only
- D1 only