Carbanions MCQ - Practice Questions & Answers

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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

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

$\left ( CH_{3} \right )_{2}\bar{C}H>\bar{C}Cl_{3}> C_{6}H_{5}\bar{C}H_{2}> \left ( CH_{3} \right )_{3}\bar{C}$

$\bar{C}Cl_{3}> C_{6}H_{5}\bar{C}H_{2}>\left ( CH_{3} \right )_{2}\bar{C}H> \left ( CH_{3} \right )_{3}\bar{C}$

$\left ( CH_{3} \right )_{3}\bar{C}> \left ( CH_{3} \right )_{2}\bar{C}H> C_{6}H_{5}\bar{C}H_{2}>\bar{C}Cl_{3}$

View Solution

The ascending acidity order of the following H atoms is :

A < B < C < D

D < C < B < A

A < B < D < C

C < D < B < A

View Solution

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, -COOC₂H_5,halogens and C₆H₅-(electron attracting) increase the stability of carbanions.

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Carbanions

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Carbanions

Chemistry Part II Textbook for Class XI

Page No. : 350

Line : 21

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