Which of the following is NOT true?
$p \to (q \land r) \equiv (p \to q) \land (p \to r)$.
$\sim (p \to q) \equiv (p \land \sim q) \lor (\sim p \land r)$.
$(p \land \sim q) \leftrightarrow (p \to q)$ is a tautology.
$((p \to q) \land (q \to r)) \to (p \to r)$ is a tautology.
