Flow Scheme of Functional Group Tests -- II?

Question

In terms of the flow-scheme for the identification of unknowns, which of the following test sequences would be appropriate for 2-butanol?

1) Chromic acid - Iodoform
2) 2,4-Dinitrophenylhydrazine - Chromic acid - Iodoform
3) 2,4-Dinitrophenylhydrazine - Lucas - Chromic acid
4) 2,4-Dinitrophenylhydrazine - Beilstein - Bromine - Chromic acid - Lucas

anyone has idea?thank you

Answer 1

2 would tell you, in order:
not a carbonyl
oxidisable, therefore an alcohol (not tertiary)
O on 2nd C atom.