Observe the following two reactions:
(I). `CH_(3)-underset(O)underset(||)C-CH+C_(2)H_(5)overset(18)Hoverset(H_(2)SO_(4))to"products"+"water"`
(II). `(X)+"water"overset(("sodium hydroxide")/(Delta))toCH_(3)-underset(O)underset(||)(C)-overset(18)(O)Na+C_(2)H_(5)OH`
the correct statements are:
A. In reaction(I) the products is `CH_(3)-underset(O)underset(||)C-overset(18)O-C_(2)H_(5)`
B. In reaction (II) the reactant is `CH_(3)-underset(O)underset(||)C-overset(18)C-C_(2)H_(5)`
C. In reaction (II) the reagent is `(H_(2)overset(18))/(Naoverset(18)OH)`
D. Reaction (I) is irreversible while reaction (II) is reversible.