Question

Which molecule has the most number of lone pairs: `Cl-CH_3`; `CO_2`; `H_2N-NH_2`; `H_4N^+""^(-)C-=N`...?

Answer 1

Of lone pairs, surely it's carbon dioxide?

Explanation:

`H_3C-Cl` has 3 lone pairs. Where are they?

`O=C=O` has 4 oxygen-centred lone pairs.

`H_2N-NH_2` has 2 nitrogen-centred lone pairs.

`H_4N^(+)""^(-)C-=N`, has 2 lone pairs, one on the carbon, and one on the nitrogen.