Which of the following statements about hydrogen bonding are correct?

1. AChlorine has an electronegativity comparable to nitrogen but forms much weaker hydrogen bonds because of its larger size
2. BHydrogen bond strength follows $\mathrm{F}-\mathrm{H}\cdot \cdot \cdot \mathrm{F}>\mathrm{O}-\mathrm{H}\cdot \cdot \cdot \mathrm{O}>\mathrm{N}-\mathrm{H}\cdot \cdot \cdot \mathrm{N}$
3. CIntramolecular hydrogen bonding raises the boiling point more than intermolecular hydrogen bonding
4. DThe energy of a typical hydrogen bond is comparable to that of a covalent bond ($\approx 400\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$)