A chemical reaction involves the interaction of reactants. The substance X ,must be an acid and in this case is CH3COOH
In chemistry, a reaction is said to occur when substances interact in such a way that other new substances are formed.
Now let us look at the particular reaction; NaOH + X ----> NaCH3COO + H2O. The substance X must be an acid. Hence, the most likely susbstance is CH3COOH.
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