(A) Arrange the following compounds in the descending order of their reactivity towards nucleophilic substitution reaction.
$C H_{3} C H O, H C H O, C H_{3} C O C H_{3}$
(B) Alkanoic acid have highest boiling points. Explain.

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Solution

Reactivity order towards nucleophillic substitution reaction
(A) $H - (C = O) - H > C H_{3} - (C = O) - H > C H_{3} - (C = O) - C H_{3}$
(B) Alkanoic acids exist in dimeric due to intermolecular Hydrogen bonding and due to H-bond carboxylic acids having high Boiling points.

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