Which of the following pathways produces 2-hexanone?
(i)1-Hexyne is treated with `H_(2)SO_(4),HgSO_(4)` and water
(ii) 3-Methyl-2-heptene is treated with `O_(3)` followed by hydrolysis
n-Butyl magnesium bromide reacts with aetaldehyde followed by hydrolysis and then chromic acid oxidation
(iv) Hydroboration oxidation of 1-hexyne
A. (i), (ii) and (iii)
B. (i) and (ii) only
C. (i) and (iii) only
D. (i) ,(ii) and (iv)