How will you convert benzene into acetophenone

How will you convert benzene into methyl benzene (toluene).

Explain the following :

Friedel-Crafts acylation

Explain the following : 

Kolbe’s electrolytic method.

If one mole of $\mathrm{HBr}$ is added to the following compounds, write down the structures of the product/products expected to the formed.

Buta-1, 3-diene

If one mole of $\mathrm{HBr}$ is added to the following compounds, write down the structures of the product/products expected to the formed.

Penta-1, 3-diene

If one mole of $\mathrm{HBr}$ is added to the following compounds, write down the structures of the product/products expected to the formed.

Penta-1, 2-diene