1. Ionic compounds have high melting point than covalent compound because Ionic bond is much stronger than covalent bonds , So for breaking the bond we require more energy as compared to covalent bonds .
2. There are fivetypes of covalent bond depending upon the number of shared electron pairs :-
• Single covalent bond :-
single covalent bond is formed by sharing of one electron pair between two atoms .
• Double covalent bond :-
It is formed by sharing of 2 electron pairs between two atoms.
• Polar covalent bond :-
A covalent bond formed between two different atoms is known as Polar covalent bond .
• Triple covalent bond :-
It is formed by sharing of 3 electron pairs.
• Non-polar covalent bond :-
A covalent bond formed between two like atoms is known as Non-polar bond.
3. HCl , NH3 , are polar molecules