Which of the following is useful in the preparation of chlorine?

Which of the following reactions is not feasible?

An aqueous solution of a halogen salt of potassium reacts with the same halogen $X_2$ to give $KX_3$,a brown-coloured solution,in which the halogen exists as the $X_3^-$ ion,$X_2$ acts as a Lewis acid,and $X^-$ acts as a Lewis base. The halogen $X$ is:

Which of the following is not a peroxy acid?

Which of the following is the strongest oxidizing agent?

Which of the following gives the correct arrangement of the hydrogen halides based on their bond strength?