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  4. Identify the atoms or groups from the following that exhibit -R effect and +R effect when present on benzene ring: <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/069f2f1ce47f3596138e6bdc4c071bd1-.png />

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Q. Identify the atoms or groups from the following that exhibit $-R$ effect and $+R$ effect when present on benzene ring:
image

TS EAMCET 2019

Solution:

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$Z$ groups are electron withdrawing groups and decrease electron density on benzene ring. These groups $(Z)$ are

image

image

$Y$ groups donate the electron and increases the electron density on benzene ring.

These groups $(Y)$ are $- OR$

$-NHCOR -X, -NH_2$