Which of the following is an open statement

Negation of the statement $(p \vee r) \Rightarrow(q \vee r)$ is :

The Boolean expression $\sim\left( {p\; \vee q} \right) \vee \left( {\sim p \wedge q} \right)$ is equivalent ot :

Which of the following is not a statement

Among the statements

$(S1)$: $(p \Rightarrow q) \vee((\sim p) \wedge q)$ is a tautology

$(S2)$: $(q \Rightarrow p) \Rightarrow((\sim p) \wedge q)$ is a contradiction

The converse of the statement $((\sim p) \wedge q) \Rightarrow r$ is