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Select the principal functional group wh...

Select the principal functional group when the following groups are present in the molecule :
(a) `-OH, -COOH, -NO_(2)`
(b) `-OCH_(3), OH, -Cl`
(c) `-CHO, -CN, -OH`
(d) `-Cl, -CONH_(2), -CHO`

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(a) `-COOH` (b) `-OH` (c) `-CN` (d) `-CONH_(2)`
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