Choose the correct statement regarding the +R or +M effect.
A
Here transfer of π (pi) electron takes place from the atom/group towards the conjugated system.
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B
Phenoxide ion does not show +R effect because it has lone pair of electrons.
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C
If a conjugated system has electron withdrawing group attached, then it shows +R effect.
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D
All of the above.
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Solution
The correct option is A Here transfer of π (pi) electron takes place from the atom/group towards the conjugated system. +R effect :
Here transfer of π (pi) electron takes place from the atom/group towards the conjugated system.
In general, the atom or group attached to the conjugated system contains a lone pair/electron pair.
If a conjugated system has electron donating group attached, then it shows +R effect
Groups showing +R effect when attached to conjugated sysytem include : −OH,−OR,−NH2,−NHR,−−O,−−CH2