Which among $\mathrm{MgBr}_2,\left(\mathrm{CH}_3\right)_3 \mathrm{P}, \mathrm{CH}_3 \mathrm{CH}_2 \m

Question

Which among $\mathrm{MgBr}_2,\left(\mathrm{CH}_3\right)_3 \mathrm{P}, \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}$ and $\left(\mathrm{CH}_3\right)_2 \mathrm{NH}$ can act as both Lewis acid and Lewis base?

Professor PC Thomas Classes · Answer

Ethanol ($CH_3CH_2OH$) acts as a Lewis base (lone pairs on O) and Lewis acid (can accept electron density via H-bond/protonation).