1.

Which of the following species are planar ?A. Singlet carbeneB. Triphenyl methyl carbocationC. Isopropyl carbanionD. Nitromethyl carbanion.

Answer» Correct Answer - A::B::D
A triphenyl methyl I carbocation, singlet carbene and nitromethylcarbanion are planar species as central carbon atom in each of them is `sp^(2)`- hybridised. In isopropyl carbanion, C is `sp^(3)`- hybridised and is pyramidal. The planar nature of nitromethyl carbanion can be explained on the basis of resonance. When the unshared pair of electrons on the carbon atom carrying -ve charge is conjugated with a multiple bond, then the carbene is always planar for resonance to occur. Another such example is allyl carbanion `(CH_(2)=CH-CH_(2)^(-)).`


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