Organic Chemistry Some Basic Principles and Techniques - Result Question 54
####60. The stability of carbanions in the following :
(a) $RC \equiv \overline{C}$
(c) $R_2 C=C \overline{H}$
(b)
(d) $R_3 C-CH_2$
is in the order of :
[2008]
(a)
(a) $>$ (b) $>$ (c) $>$ (d) (b)
(b) $>$ (c) $>$
(d) $>$ (a)
(c) (d) $>$ (b) $>$ (c) $>$ (a) (d)
(a) $>$ (c) $>$ (b) $>$ (d)
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Solution:
- (a) As ’ $s$ ’ character increases, stability of carbanion increases. Also, electron donating groups decreases the stability of carbanion. Hence, the correct stability, order:
$\underset{+1}{R_3} \to C \underset{s p^{3}}{\stackrel{\ominus}{C}} H_2$
