Aldehydes, Ketones and Carboxylic Acids · Question 39

JEE Main 2025 (Online) 28th January Morning ShiftMCQEasy📈 Topic in 10% papers+4−1

The compounds that produce CO2 with aqueous NaHCO3 solution are: Choose the correct answer from the options given below:

A and C Only
A, B and E Only
A and B Only
A, C and D Only

Answer

(4) A, C and D Only

Solution

A compound liberates CO2 from NaHCO3 only if it is a stronger acid than carbonic acid (pKa 6.4).

A. Benzoic acid (pKa 4.2) ✓

B. Phenol (pKa 10.0) ✗

C. 2,4,6-Trinitrophenol (picric acid, pKa 0.7): three -NO2 groups (–R, –I) stabilise the phenoxide ion strongly ✓

D. Cyclohexanecarboxylic acid (pKa ≈ 4.9) ✓

E. 4-Methoxyphenol: the +R effect of -OCH3 makes it even weaker than phenol ✗

A, C and D.

Answer: (4)

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Keep practising — Aldehydes, Ketones and Carboxylic Acids

The total number of compounds from below when treated with hot KMnO4, giving benzoic acid is: [figure] , [figure] , [figure] , [figure] , [figure] , [figure] , [figure] , [figure]

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