Match the gases given in column I to the identification of the gases

Match the gases given in column I to the identification of the gases mentioned in column II:

(i) D or turns moist lead acetate paper silvery black

(ii) C or turns reddish brown when it reacts with oxygen

(iii) B or turns lime water milk

(iv) A or turns acidified potassium dichromate solution green / B or turns lime water milky or A and B