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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
.niraj . Varma. posted an Question
September 01, 2022 • 22:00 pm
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30 points
30 points
- IIT JAM
- Chemistry (CY)
Column-i (carbanions) column -ii (half lives) ch c (a) t (p) 4.3x 10 s ca2hs ch q) 2.5x 10°s ch (c) (r) 8.7 x 10-/ s ch3 ch p) (s)1.4 x 10 s hc chs a) (a-r}), (
Column-I (Carbanions) Column -II (Half lives) CH C (A) T (P) 4.3x 10 s Ca2Hs CH Q) 2.5x 10°s CH (C) (R) 8.7 x 10-/ s CH3 CH P) (S)1.4 x 10 s HC CHs a) (A-R}), (B-S), (C-O), (D-P) (6) (A-R), (B-O. (C-S), (D-P (c)(A-S), (B-Q).(CP), (D-R) (d) (A-O).(B-S), (C-P), (D-R
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Shabir ahmad bhat![best-answer]()
Option a is correct. the carbanion B is most stable because the Nitro group at para position will stabilize the resonating structures thus B has more life time. the least stable carbanion is D because it is not stabilized by resonance. the carbanion C is more stable than A because the methoxy group at meta position stabilizes the carbanion by -I effect whereas in carbanion A the alkyl group at para position destabilizes the resonating structures by hyperconjugation and +I effect.