The correct option is D a- D, b- C, c- B, d- A
1) NaCl contains ionic bond formed by the transfer of an electron from sodium atom to chlorine atom.
2) N2 molecule contains a triple covalent bond formed by the sharing of three electrons between the two nitrogen atoms.
3) O2 molecule contains a double covalent bond formed by the sharing of two electrons between the two oxygen atoms.
4) CH4 molecule contains four single covalent bonds, each formed by the sharing of one electron between carbon and a hydrogen atom.