$1.$ Which of the following represents a hemiacetal? Et $=$ethyl

$2.$ Which of the following statements about acetals is not true?

A$.$ The reaction to form an acetal is reversible.

B$.$No catalyst is required for the formation an acetal.

C$.$ Two equivalents of alcohol are required to form an acetal from an aldehyde or ketone.

D$.$The equilibrium of the reaction to from an acetal favors reactants not products.