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By Expert Faculty of Sri Chaitanya
a
-OR
b
-NHCOR
c
-NH2
d
-COOH
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Correct option is D
The atoms or substituent groups, which represent +R or -R electron displacement effects are as follows ;+R-effect: - halogen, -OH,-OR,-OCOR,-NH2 -NHR,-NR2,-NHCOR-R-effect; -COOH,-CHO,>C==O,-CN,-NO2Thus, -COOH is a - R effect showing group while other show +R effect.
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Which of the following ions does not show resonance?
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