Question

Most stable carbanion is :

• A. $HC\equiv C^{\Theta }$
• B. $C_6{H}_5^{\Theta }$
• C. $(C{H}_3{)}_{3}C-C{H}_2^{\Theta }$
• D. $(C{H}_3{)}_{2}C=C{H}^{\Theta }$

Answer 1

The correct option is A $HC\equiv C^{\Theta }$

In $HC\equiv C^{\Theta }$ carbanion is present on sp hybridized carbon atom which is most electronegative as s character is more so carbanion is stable.

While in $C_6{H}_5^{\Theta }$ and ${\left({CH}_3\right)}_{2}C={CH}^{\Theta }$ carbonianis present on $s{p}^2$ carbon atom which has less electronegative than sp. In ${\left({CH}_3\right)}_{3}C-{CH}_2^{\Theta }$ carbanion is foresent on $s{p}^3$ hybridized carbon atom which is least electronegative so, $CH\equiv C^{\Theta }$ carbanion is most stable.