Acid catalysed hydration of alkene except ethene leads to the formation of

In which of the following case will ${\mathrm{NO}}_2^{+}$ attack at the meta position:

(I) 

(II) 

(III) 

(IV) 

What is the final product $\mathrm{A}$ in the above reaction?

The reaction of propene with $\mathrm{HOCl}$ proceeds via the addition of