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The correct order of reactivities of nucleophilic addition across -C=O of the RCOR ,RCHO and ArCHO is

$\begin{array}{1 1}(a)\;RCHO < ArCHO < RCOR\\(b)\;ArCHO < RCOR < RCHO\\(c)\;ArCHO < RCHO < RCOR\\(d)\;RCHO < RCOR < ArCHO \end{array}$

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Aliphatic aldehyde reacts faster than ketones and aromatic aldehydes,because steric and electronic reasons.
Hence (b) is the correct answer.
answered Feb 19, 2014 by sreemathi.v
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