Find the number of compounds which evolve effervescence of $C O_{2}$ with aqueous $NaHC O_{3}$ :
(i) (ii) (iii) (iv)
(v) (vi) (vii) (viii)

Question

Find the number of compounds which evolve effervescence of C O 2 ​ with aqueous NaHC O 3 ​ : (i) (ii) (iii) (iv) (v) (vi) (vii) (viii)

TestHub · Accepted Answer

Effervescence needs an acid stronger than carbonic acid ( $p K_{a}$ 6.4).

(i) 2,4,6-Trinitrophenol ( $p K_{a}$ 0.4): yes. (ii) 4-Nitrophenol (7.2): no. (iii) Salicylic acid (3.0): yes. (iv) Methanesulphonic acid: yes. (v) 2-Nitrophenol (7.2): no. (vi) Phenol (10): no. (vii) Oxalic acid (1.3): yes. (viii) Ethyl acetoacetate (about 11): no.

Total = 4.

Answer: 4.

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