Question

Grignard reagent behave as

• A. $\mathrm{Nucleophile}\mathrm{only}$
• B. $\mathrm{Base}\mathrm{only}$
• C. $\mathrm{Nucleophile}\mathrm{as}\mathrm{well}\mathrm{as}\mathrm{base}$
• D. $\mathrm{Electrophile}$

Answer 1

The correct option is C $\mathrm{Nucleophile}\mathrm{as}\mathrm{well}\mathrm{as}\mathrm{base}$

i) It behaves as nucleophile. It gives nucleophilic addition with carbonyl compounds.
$R-\stackrel{O}{\stackrel{||}{C}}-R\underset{2.H_3{O}^{+}}{\overset{1.R^{\prime }MgX}{\to }}R-\stackrel{HO}{\stackrel{|}{\underset{R^{\prime }}{\underset{|}{C}}}}-R$

ii) It also behaves as a base. It reacts with compound with acidic hydrogen.
$R-\stackrel{O}{\stackrel{||}{C}}-O-H+R^{\prime }-MgX\to R-\stackrel{O}{\stackrel{||}{C}}-\stackrel{\ominus }{O}-\stackrel{\oplus }{Mg}X+R^{\prime }-H$