Question

A compound a(c2h4o2)react with na metal to form a compound b and evolves a gas hich a pop sound

Answer 1

C2H4O2 or CH3COOH(Acetic acid) reacts with na or sodium metal to produce a salt named sodium acetate and hydrogen gas

Therefore,

A ----> acetic acid or ethanoic acid

B ----> hydrogen gas

Answer 2

2C2H4O2 + 2Na = 2C2H302Na +H2

                      OR

2CH3COOH + 2Na = 2CH3COONa +H2

A= ethanoic acid

b= sodium acetate