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Carbanions MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 25, 2023 25:24 PM | #NEET

Quick Facts

  • Carbanions is considered one the most difficult concept.

  • 10 Questions around this concept.

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Arrange the carbanions,

\dpi{100} \left ( CH_{3} \right )_{3}\bar{C},\bar{C}Cl_{3},\left ( CH_{3} \right )_{2}\bar{C}H,C_{6}H_{5}\bar{C}H_{2}

in order of their decreasing stability

The pair of electron in the given carbanion, $\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{C}^{\ominus}$ is present in which of the following orbitals?

The pair of electron in the given carbanion, $C H_3 C \equiv C^{-}$, is present in which of the following orbitals?

Concepts Covered - 1

Carbanions

The carbon species carrying a negative charge on carbon atoms is called carbanion. Carbon in carbanion is generally sp3 hybridised and its structure is distorted tetrahedron as shown in the figure given below. Carbanions are also unstable and reactive species.

                                                                           

The stability order of carbanions:-

1. The stability of carbanions is influenced by resonance, inductive effect and s-character of orbitals. The group having +I effect decreases the stability while groups having -I effect increase the stability of carbanions.

2. The groups like -NO2, -CN, -COOC2H5,  halogens and  C6H5-(electron attracting) increase the stability of carbanions.

 

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Carbanions

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Reference Books

Carbanions

Chemistry Part II Textbook for Class XI

Page No. : 350

Line : 21

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