(a) The chemical name of vinegar is ethanoic acid. In fact, it is a dilute solution of ethanoic acid. Its chemical formula is `CH_(3)COOH`.
(b) Hydrogen gas is evolved in the reaction and is accompanied by brisk effervescence.
`underset("Ethanol")(2C_(2)H_(5)OH)+2Natounderset("Sod. ethaxide")(2C_(2)H_(5)ON a)+H_(2)`.