Which statement is wrong?
(1) For SN2 reaction, order of reactivity of alkyl halides is 1° > 2° > 3° .
(2) For SN1 reaction, order of reactivity of alkyl halides is 1° < 2° < 3° .
(3) SN2 reaction takes place through carbocation formation.
(4) SN1 reaction takes place through carbocation formation.