What is the statement $(p$ $\rightarrow \sim p) \wedge (\sim p$ $\rightarrow p)$?

Let $S$ be a non-empty subset of $\mathbb{R}$. Consider the following statement:
$p$ : There is a rational number $x \in S$ such that $x > 0$.
Which of the following statements is the negation of the statement $p$?

The negation of the statement "The payment will be made if and only if the work is finished in time" is

Let $p, q, r$ denote arbitrary statements. Then the logical equivalent of the statement $p \Rightarrow (q \vee r)$ is

The contrapositive of the statement "If $I$ reach the station in time,then $I$ will catch the train" is

For the statement: "If a quadrilateral $ABCD$ is a rhombus,then its opposite sides are parallel",its contrapositive and converse are respectively given by: