Question

Which one of the following is not a base?

• A. $N_2H_4$
• B. $NH_2OH$
• C. $(CH_3)_3N$
• D. $HN_3$

Answer 1

Answer: (D)

D) $HN_3$

Answer 2

Hydrazine ($N_2H_4$), hydroxylamine ($NH_2OH$), and trimethylamine ($(CH_3)_3N$) are all bases because their nitrogen atoms possess lone pairs of electrons, enabling them to accept protons (Brønsted-Lowry bases) or donate electron pairs (Lewis bases). Hydrazoic acid ($HN_3$), however, is an acid, characterized by its ability to donate a proton. Thus, $HN_3$ is not a base.