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  4. Which of the aldehyde is most reactive?

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Q. Which of the aldehyde is most reactive?

ManipalManipal 2005Aldehydes Ketones and Carboxylic Acids

Solution:

Among carbonyl compounds, reactivity decrease with increase in alkyl groups as alkyl groups ( $ +I $ effect) decrease positive character on C-atom. Thus, the correct order of reactivity is-
$ HCHO>C{{H}_{3}}CHO>{{C}_{6}}{{H}_{5}}CHO $