1)

The compound that  does not liberate CO2, on treatment with aqueous sodium bicarbonate  solution is 


A) benzoic acid

B) benzenesulphonic acid

C) salicylic acid

D) Carbolic acid (phenol)

Answer:

Option D

Explanation:

 Plan    $NaHCO_{3}\rightleftharpoons Na^{+}+HCO_{3}^{-}$

 $HCO_{3}^{-}$   is decomposed by acid releasing CO2

 $HCO_{3}^{-}+H^{+}\rightarrow H_{2}O+CO_{2}$

 If acid is stronger than $HCO_{3}^{-}$     then CO2 is released 

 Phenol is less acidic and thus does not liberate CO2   and NaHCO3