Question:
When sodium bicarbonate is added to an organic compound, brisk effervescences is evolved. This indicate the presence of which functional group.
When sodium bicarbonate is added to an organic compound, brisk effervescences is evolved. This indicate the presence of which functional group.
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Only acids stronger than carbonic acid release CO2 from bicarbonate.
Updated On: Oct 1, 2026
- \(-\text{CHO}\)
- \(-\text{C} = \text{O}\)
- \(-\text{COCl}\)
- \(-\text{COOH}\)
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The Correct Option is D
Solution and Explanation
Step 1: Reaction
Carboxylic acids are stronger than carbonic acid, so they decompose bicarbonate: \(RCOOH + NaHCO_3 \rightarrow RCOONa + H_2O + CO_2\uparrow\).
Step 2: Meaning
The brisk effervescence is carbon dioxide. Aldehydes, ketones and acid chlorides do not give this test with bicarbonate.
Final Answer:
The group is carboxylic acid, -COOH. \[ \boxed{\text{(D)}\ -\text{COOH}} \]
Carboxylic acids are stronger than carbonic acid, so they decompose bicarbonate: \(RCOOH + NaHCO_3 \rightarrow RCOONa + H_2O + CO_2\uparrow\).
Step 2: Meaning
The brisk effervescence is carbon dioxide. Aldehydes, ketones and acid chlorides do not give this test with bicarbonate.
Final Answer:
The group is carboxylic acid, -COOH. \[ \boxed{\text{(D)}\ -\text{COOH}} \]
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