Which of the following is most stable towards heat?

The incorrect statement is:

State the symbol,atomic number,and electronic configuration of Tennessine.

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R).$
Assertion $(A):$ $ICl$ is more reactive than $I_{2}.$
Reason $(R):$ $I-Cl$ bond is weaker than $I-I$ bond.
In the light of the above statements,choose the most appropriate answer from the options given below:

When $KBr$ is treated with conc. $H_2SO_4$,a reddish-brown gas is evolved. The evolved gas is:

Which of the following aqueous acids is the most acidic?