Question
When sodium bicarbonate is added to an organic compound, brisk effervescences is evolved. This indicate the presence of which functional group.
MHT CET
Chemistry
Carboxylic Acid Derivatives
2026
MHT CET 2026 (16 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. - CHO
- B. - C = O
- C. - COCl
- D. - COOH
Answer
D. - COOH
Step-by-step solution
Sodium bicarbonate (NaHCO_3) is a weak base that reacts with compounds more acidic than carbonic acid (H_2CO_3). Carboxylic acids (- COOH ) react with sodium bicarbonate to produce sodium carboxylate, water, and carbon dioxide gas. The reaction is given by: R- COOH + NaHCO_3 R- COONa + H_2O + CO_2 The evolution of carbon dioxide (CO_2) gas is observed as brisk effervescence. This test is the standard qualitative test used to detect the presence of the carboxylic acid functional group in an organic compound. Answer: - COOH
Related: Chemistry — Carboxylic Acid Derivatives · All PYQ Banks