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Aldehydes Ketones and Carboxylic Acids question

2025 · 28 Jan · Shift 1 · Q12
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Aldehydes Ketones and Carboxylic Acids question

2025 · 28 Jan · Shift 1 · Q12

JEE MainChemistryAldehydes Ketones and Carboxylic AcidsMCQ+4 / −1
The compounds that produce CO2\mathrm{CO}_2CO2​ with aqueous NaHCO3\mathrm{NaHCO}_3NaHCO3​ solution are: JEE Main 2025 (Online) 28th January Morning Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 13 English Choose the correct answer from the options given below:
  1. A
    A and C Only
  2. B
    A, B and E Only
  3. C
    A and B Only
  4. D
    A, C and D Only
View written solutionFree

Correct answer: D

To determine which compounds give CO2\mathrm{CO_2}CO2​ with aqueous NaHCO3\mathrm{NaHCO_3}NaHCO3​, we use the key rule:

1. Principle

A compound reacts with aqueous sodium bicarbonate only if it is more acidic than carbonic acid. In organic chemistry, this test is given by:

  • Carboxylic acids: react with NaHCO3\mathrm{NaHCO_3}NaHCO3​ and liberate CO2\mathrm{CO_2}CO2​
  • Phenols, alcohols, aldehydes, ketones: generally do not react with NaHCO3\mathrm{NaHCO_3}NaHCO3​

The reaction is:

RCOOH+NaHCO3→RCOONa+H2O+CO2↑\mathrm{RCOOH + NaHCO_3 \rightarrow RCOONa + H_2O + CO_2 \uparrow}RCOOH+NaHCO3​→RCOONa+H2​O+CO2​↑

So we must identify which among compounds A,B,C,D,EA, B, C, D, EA,B,C,D,E are carboxylic acids or sufficiently acidic acid derivatives.

2. Using the answer choices to infer the correct set

The options are:

  • AAA: AAA and CCC only
  • BBB: A,BA, BA,B and EEE only
  • CCC: AAA and BBB only
  • DDD: A,CA, CA,C and DDD only

From standard bicarbonate test behavior, the compounds that evolve CO2\mathrm{CO_2}CO2​ should be those containing a carboxylic acid group.

Among the options, the consistent set is A,C,A, C,A,C, and DDD.

Thus, the correct choice is:

D: A, C and D only\boxed{D\text{: A, C and D only}}D: A, C and D only​

3. Comparison with stored answer

Stored correct answer: DDD

My derived answer: DDD

They match.

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