Mathematical Reasoning

Given the following two statements:
(S₁): (q∨p) → (p ↔~ q) is a tautology.
(S₂): ~ q∧ (~ p ↔ q) is a fallacy. Then:

Let p, q, r be three statements such that the truth value of (p ∧ q) → (~ q ∨ r) is F. Then the truth values of p, q, r are respectively:

The proposition p →~ (p ∧~ q) is equivalent to:

Which of the following is tautology?

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

The Boolean [removed]p ⇒ q) ∧ (q ⇒ ¬p) is equivalent to:

Let $A,B,C$ and $D$ be four non - empty sets. The contrapositive statement of "If $A\subseteq B$ and $B\subseteq D$ , then $A\subseteq C$  " is:

The statement (p→(q→p))→(p→(p∨q)) is:

Which one of the following is a tautology?