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Dinesh khalmaniya 1 Best Answer
A,B,C,D Generally carboxylic acid gives the test with NaHCO3 and here B, and C are carboxylic acid so easily gives CO2 when reacted with NaHCO3. But here A (Squaric acid ) and D(picric Acid) are most acidic compounds so they are capable to decompose NaHCO3
how
how to know who give the test
just remember all carboxylic acid, Squaric acid and picric acid
Squaric acid and picric acid gives this test even these doesn't have cooh group due to have most acidic