Reactivity of $H C H O (I), C H_{3} C H O (I I)$ and $C_{6} H_{5} C H O (I I I)$ towards nucleophile is in order :

I > III > II

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III > II > I

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I = II > III

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I > II > III

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Solution

The correct option is C I > II > III
Formaldehyde is most reactive because it is not stabilized.

Benzaldehyde is least reactive because it is most stabilized by the electron donating effect of phenyl ring.

Option D is correct.

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