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a
r1>r2 but r3>r4
b
r2>r1 but r3>r4
c
r1>r2 but r4>r3
d
r2>r1 but r4>r3
answer is D.
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Detailed Solution
Although bromination of nitrobenzene is more difficult than nitration of bromobenzene (i.e. r2>r1 but in case of second electrophilic substitution r4>r3.