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Question:

The pair of an electron in the given carbanion, CH3C≡C⁻, is present in which of the following orbitals?

sp3

sp2

sp

2p

Solution:

The pair of an electron in the CH3−C≡C⁻ is present at the ≡C⁻ carbon which has 1 σ bond pair and two π bonds and 1 lone pair of electrons. Thus it is sp hybridized and the pair of electrons in the given carbanion is present in the sp orbital.