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Q.

A group which deactivates the benzene ring towards electrophilic substitution but which directs the incoming group principally to the o- and p-positions is

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a

-NO2

b

-Cl

c

-NH2

d

-C2H5

answer is B.

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Detailed Solution

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Electron accepting groups which make the substitution difficult are known of deactivating groups. The group or substituent already present on the ring also decides the position of incoming group.
Ortho- and para-directing groups are as follow

CH3,C2H5R,NH2,OH,halogens,Cl,Br,I

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A group which deactivates the benzene ring towards electrophilic substitution but which directs the incoming group principally to the o- and p-positions is