- A

- B

- C

- D

View written solutionFree
Correct answer: D
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Principle involved
A compound will give effervescence of with aqueous if it is more acidic than carbonic acid.
The relevant reaction is:
So, compounds containing sufficiently acidic groups such as:
- carboxylic acids,
- strong phenols with electron-withdrawing groups,
- mineral acids, are likely to produce .
-
What is asked?
We need the compound least likely to give effervescence with .
That means we should identify the option that is not acidic enough to liberate from bicarbonate.
-
Key chemical idea
Ordinary phenols are weaker acids than carbonic acid and generally do not react with to release .
On the other hand:
- carboxylic acids do,
- stronger acids do,
- highly activated phenols (for example, with multiple nitro groups) may also do so.
-
Issue with the given options
The actual structures/options for A, B, C, and D are not visible in the prompt, so a direct option-by-option evaluation is not possible.
However, based on the stored correct answer being D, the intended option is most likely the compound that is least acidic among the choices (commonly an ordinary phenol or similar weak acid), and hence least likely to evolve with aqueous .
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Conclusion
Therefore, the answer is:
This is consistent with the rule that only acids stronger than carbonic acid liberate from bicarbonate, while weaker acids generally do not.
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