1.
How many of the statement(s) are correct?

(i) The nucleophile makes a rear attack in SN_N2 reaction and expels the leaving group from front side.

(ii) CH3_3O-CH==CH2_2 adds to HBr according to Anti-Markownikoff's rule.

(iii) The basicity of halides decreases in the order F^- > Cl^- > Br^- > I^-, but the nucleophilicity is reverse of it (in polar protic solvents).

(iv) The rate of SN_N2 reaction is independent of the polarity of the solvent.

(v) Sigma complex or arenium ion is resonance stabilised.