Following conversion can be done in four steps using four reagents one after the other. These four reagents are listed below with some other reagents.
Write the number of must suited reagent, in order you want to use them and present the four digit number in OMR sheet.For example if you want to use (1) than (2) than (3) than (4) fill 1234 in OMR sheet.

(1) `O_(3)//Zn//H_(2)O` (2) `O_(3)//H_(2)O`
(3)`conc.H_(2)SO_(4)//Delta` (4) `aq. KOH //Delta`
(5) `H_(2)//Ni` (6)Zn-Hg//HCl
(7) `NH_(2)-NH_(2)//EtOK` (8)`H_(3)O^(o+)`
(9) `NaOH//CaO"/"triangle`

Answer

3145