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Which of the following species are plana...

Which of the following species are planar ?

A

Singlet carbene

B

Triphenyl methyl carbocation

C

Isopropyl carbanion

D

Nitromethyl carbanion.

Text Solution

Verified by Experts

The correct Answer is:
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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DINESH PUBLICATION-BASIC PRINCIPLES OF ORGANIC CHEMISTRY-SELECTED STRAIGHT OBJECTIVE TYPE MCQS
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