a. i. What effect does a hot, concentrated solution of acidified potassium manganate(VII) have on an alkene?

ii. Why is this reaction useful to chemists?

b. An alkene is known to be either but-1-ene or but-2-ene. When heated with concentrated acidified potassium manganate(VII) solution, bubbles of carbon dioxide gas were given off. Name the alkene.

c. Pent-2-ene is heated with concentrated acidified potassium manganate(VII) solution.

i. Draw the displayed formulae of the products and name them.

ii. Write a balanced chemical equation for this reaction, using [O] to show oxygen atoms involved. 

d. 2-Methylbut-2-ene is heated with concentrated acidified potassium manganate(VII) solution.

i. Draw the displayed formulae of the products and name them.

ii. Write a balanced chemical equation for this reaction, using [O] to show oxygen atoms involved.