Chemistry - GOC Question with Solution | TestHub

Question Explanation :

Count compounds that release ${\mathrm{CO}}_2$ with ${\mathrm{NaHCO}}_3$ (i.e., acids stronger than ${\mathrm{H}}_2{\mathrm{CO}}_3$ ). Concept :

Acidity Comparison ( ${\mathrm{pK}}_{\mathrm{a}}<6.4$ ).

Solution :

Reactive (Stronger Acids):

1. Methanesulphonic acid (CH₃SO₃H) : Strongest acid (pK ≈ –2).

2. Picric Acid: Very strong organic acid (pK ≈ 0.38).

3. 2,4-Dinitrophenol: Enhanced acidity (pK ≈ 4.0).

4. Benzoic Acid: Standard carboxylic acid (pK ≈ 4.2).

• Non-Reactive (Weaker Acids):    

• Phenol (pK ≈ 10). and Ethanol (pK ≈ 16) are too weak.

• Total: 4 compounds.