Each of the following statements below is written in reference to reactions (SN1, SN2, E1 and E2) of alkyl halides. State [not more than two], that is (or are) most consistent with each statement: It involves carbocation intermediate. (i) SN1 SN2 E1 E2 It is first order SN1 in alkyl halide and first order in nucleophile. (ii) SN2 E1 E2 It involves complete inversion of configuration at the site of (ii) SN1 SN2 E1 E2 the substitution. (iv) Its substitution SN1 SN2 E1 E2 at the chiral centre gives predominantly a racemic mixture. (v) The SN1 SN2 E1 E2 rearrangement s are common. (vi) The order of SN1 SN2 E1 E2 reactivity for alkyl halide follows 3 > 2 > 1