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Find the number of electron - donating g...

Find the number of electron - donating groups in resonance among the following :
`{:("a) "-CONH_(2), "b) "-NO_(2), "c) "-OCOCH_(3), "d) "-COOCH_(3)), ("e) "-CHO, "f) "-NHCOCH_(3),"",""):}`

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The correct Answer is:
2
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