Question

For the various types of interactions, the correct order of increasing strength is

1. Covalent < hydrogen bonding < van der Waals < dipole –dipole    
2. van der Waals < hydrogen bonding<dipole-dipole <covalent    
3. van der Waals < dipole – dipole < hydrogen boding < covalent    
4. dipole – dipole < van der Waals < hydrogen bonding <covalent.