Answer:
A) hydrogen bond; B) polar covalent bond
Explanation:
A) hydrogen bond: Hydrogen bonding because there is an electrostatic attraction between a proton and to an electronegative atom of another molecule. In the case of the hydrogen (the proton) atom pairs to the two lone electrons of oxygen (electronegative atom).
B) polar covalent bond: In a covalent bond electrons are shared between the pairing groups. The oxygen atom has a higher electronegativity than hydrogen, attracting the electrons stronger, hence the covalent bond is referred to as 'polar'. The covalent bond would be 'nonpolar' if electronegativity was equal.
