The pair of electron in the given carbanion, C H 3 C ≡ C ⊖ is present in which of the following orbitals?

$\mathrm{C}{\mathrm{H}}_3-\mathrm{C}\equiv {\mathrm{C}}^{\ominus \mathrm{ }}$ : In the carbanion, the carbon is having 1 sigma bond, $2\mathrm{\pi }$ bonds and 1 lone pair therefore C is sp hybridized and lone pair is present in hybridised orbital.