1. 2p 2. sp³ 3. sp² 4. sp

Topic: Tetravalency of carbon, hybridization and shapes· Some Basic Principles of Organic Chemistry

The pair of electron in the given carbanion, CH_3C C^, is present in which of the following orbitals ?

1. 2p

2. \(sp^3\)

3. \(sp^2\)

4. sp

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Answer: 4. sp

Key idea: the carbanion carbon in \(\mathrm{CH_3C\equiv C^-}\) is triply bonded to another carbon, so it has 2 regions of electron density and is sp hybridised (one sigma bond to the other C, plus the lone pair).

The lone pair sits in an sp hybrid orbital, option 4. The higher s-character (50%) is the reason terminal alkynes are acidic.

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The pair of electron in the given carbanion, CH_3C C^, is present in which of the following orbitals ?

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