How does ethylene react with :
(i) bromine
(ii) alkaline potassium permanganate
(iii) ozone (iv) hydrogen?

How does acetylene react with : (i) oxygen (ii) bromine (iii) ozone (iv) water (v) HBr.

How do you count for the following observations ? (a) Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why ? Write a balanced redox equation for the reaction. (b) When concentrated sulphuric acid is added to an inorganic mixture containing chloride, we get colourless pungent smelling gas HCl, but if the mixture contains bromide then we get red vapour of bromine. Why ?

(a) Describe the preparation of potassium dichromate from chromite ore: (b) How does the acidified solution of potassium permanganate react with (i) oxalic acid (ii) iron (II) ions.

(i) Take about 3 mL, of ethanol is a rest tube and warm it gently in a water bath. (ii) Add a 5% solution of alkaline potassium permanganate drop by drop to the solution. (iii) What happens to the colour of KMnO_(4) added initially and then in excess? Give reason. Name the product of this reaction.

A compound 'A' decolourises bromine water and it undergoes catalytic reduction to give decalin. When 'A' Treated with how conc. Potassium permanganate and acidification gives cis-cyclohexane-1,2-dicarboxylic acid and oxalic acid. Compound 'A' is