SATHEE: Organic Chemistry Some Basic Principles and Techniques

Organic Chemistry Some Basic Principles and Techniques - Result Question 54

####60. The stability of carbanions in the following :

(a) $R C \equiv \overset{―}{C}$

(b)[c-]1ccccc1

(d) $R_{3} C - C H_{2}$

is in the order of :

[2008]

(a)

(a) $>$ (b) $>$ (c) $>$ (d) (b)

(b) $>$ (c) $>$

(d) $>$ (a)

(a) $>$ (c) $>$ (b) $>$ (d)

Show Answer

Solution:

(a) As ’ $s$ ’ character increases, stability of carbanion increases. Also, electron donating groups decreases the stability of carbanion. Hence, the correct stability, order:

$\underset{+ 1}{R_{3}} \to C \underset{s p^{3}}{\overset{⊖}{C}} H_{2}$

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Organic Chemistry Some Basic Principles and Techniques - Result Question 54

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