Account for the following :(1) CH3CHO is more reactive with HCN than C

1.	Account for the following :(1) CH3CHO is more reactive with HCN than CH3COCH3.(2) Carboxylic acids are stronger acids than phenol.
Answer» (1) CH₃CHO is more reactive than CH3COCH₃ due to smaller +I effect of one methyl group. CH₃CHO is less hindered than CH₃COCH₃ towards (Nu^–). Therefore, nucleophilic addition reactions occur more in CH₃CHO. (2) Carboxylic acids are acidic because of resonance stabilisation of carboxylate anion while phenols are acidic due to resonance stabilisation of phenoxide ion. Carboxylic acids are more acidic than phenols because the negative charge in carboxylate ion is more spread out than phenoxide ion as there are two electronegative O-atoms in carboxylate anion in comparison to phenoxide ion.

Account for the following :(1) CH3CHO is more reactive with HCN than CH3COCH3.(2) Carboxylic acids are stronger acids than phenol.

Answer»

(1) CH₃CHO is more reactive than CH3COCH₃ due to smaller +I effect of one methyl group. CH₃CHO is less hindered than CH₃COCH₃ towards (Nu^–).

Therefore, nucleophilic addition reactions occur more in CH₃CHO.

(2) Carboxylic acids are acidic because of resonance stabilisation of carboxylate anion while phenols are acidic due to resonance stabilisation of phenoxide ion. Carboxylic acids are more acidic than phenols because the negative charge in carboxylate ion is more spread out than phenoxide ion as there are two electronegative O-atoms in carboxylate anion in comparison to phenoxide ion.

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