1.

Give the order of the stabilities of the following : (i) (a) PhCH_2^(oplus) (b) Ph_2C overset (oplus) H ( c) Me_2Ch^(oplus) (d) Me_3C^(oplus) ( e) C_2 H_5^(oplus) (f) Ch_3^(oplus) (ii) (1) PH_3 dot C (b) Ph dot C H_2 ( c) Me_3 dot C (d) dot C_2 H_5 ( e) dot C H_3 (iii) (a) b) Ph_3C^(Ө) ( c) Me_2 CH^(Ө) (d) overset (Ө) CH_3 ( e) overset (Ө) C_2 H_5 (f) Me_3 C^(Ө).

Answer»

Solution :(i) `Ph_2 CH^(OPLUS) gt PhCH_2^(oplus) gt Me_3 C^(oplus) gt Me_2 CH^(oplus) C_2 H_5^(oplus) gt CH_2^(oplus) (b gt a gt d gt c gt e gt f)`
(ii) `Ph_3 DOT C gt Ph dot C H_2 gt Me_3 dot C gt dot C_2 H_5 gt dot CH_3 (a gt b gt c gt d GTE )`
(ii) `a gt b gt d gt e gt c gt f`
(a) Aromatic (six `overline e` systems with conjugation, resonance stabilised)
(b) Triphenyl methane carbanion (stabilished by resonance by three `Ph` GROUPS)
(c) `overset (Ө) CH_3` (`1^@` carbanion)
( d) `overset (Ө)C_2 H_5` (ethyl carbanion)
(e) `2^@` Carbanion
(f) `3^@` carbanion (the stability of carbanion : `1^@ gt 2^@ gt 3^@`).


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