Question

Which compounds are lewis bases? select all that apply. h―c≡c―h h− nh3 ch3ch2ch3?

Answer 1

The Lewis bases are those which can donate electron pair to an acceptor. These electrons can be a pair of electron that is a lone pair, a negative charge or electrons in a $\pi$-bond.

• In $H-C\equiv C-H$, the presence of $\pi$-bond make it a Lewis base.
• In $H^{-}$, the presence of negative charge makes it a Lewis base.
• In $NH_3$, the presence of lone pair on nitrogen makes it a Lewis base.
• In $CH_3CH_2CH_3$, there is no lone pair, no $\pi$-bond, no negative charge so it is not a Lewis base.

Hence, $H-C\equiv C-H$, $H^{-}$, and $NH_3$ are Lewis bases.