Question

Which of the following compounds does NOT contain molecules?
a. H2
b. NaCl
c. CO2
d. H2O

Answer 1

B, molecules are ionic bonding this is covalent 

Answer 2

Answer:

NaCl does not contain molecules

Explanation:

Molecules are made of multiple atoms bonded together to form a single entity.

In $H_{2}$ (H-H), two hydrogen atoms are bonded together through a covalent bond. Hence it is a molecule.

In $CO_{2}$ (O=C=O), one carbon atom and two oxygen atoms are bonded together through double bond. Hence it is molecule

In$H_{2}O$ (H-O-H), one oxygen atoms and two hydrogen atoms are bonded together through single bond. Hence it is a molecule.

In NaCl, $Na^{+} and Cl^{-}$ ions are held together through ionic attraction forces. Here no actual bond exists between $Na^{+} and Cl^{-}$. Both $Na^{+} and Cl^{-}$ remain present as individual ions.

Hence NaCl does not contain molecules