Question

The pair of electron in the given carbanion, $CH\equiv C^{\ominus }$ is present in which of the following orbitals?

• A. $s{p}^3$
• B. $s{p}^2$
• C. sp
• D. $s{p}^{3}d$

Answer 1

The correct option is C

sp

The carbon of interest has 3 bonds, only one of which is a $\sigma$-bond. The other two are $\pi$-bonds. The negative charge implies there is a lone pair (the carbon has a complete octet). According to VSEPR, it is $sp$-hybridised.