Which group from the following is responsible | vedclass

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Question

(A) The $(-R)$ effect or negative resonance effect occurs when a group withdraws electron density from the conjugated system through resonance.Groups

Vedclass · Accepted Answer

$-COOR$

Vedclass · Answer

(A) The $(-R)$ effect or negative resonance effect occurs when a group withdraws electron density from the conjugated system through resonance.Groups like $-OR$,$-OH$,and $-NHR$ have lone pairs on the atom directly attached to the conjugated system,which they donate,thus exhibiting a $(+R)$ effect.The group $-COOR$ contains a carbonyl group $(C=O)$ conjugated with the rest of the molecule. The oxygen atom of the carbonyl group is more electronegative,pulling electron density away from the conjugated system,which results in a $(-R)$ effect.

Which group from the following is responsible for the $(-R)$ effect?

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