Question

how to prepare Methane from Benzene

Answer 1

I don't know what you asked please explain question properly

Answer 2

▶️▶️▶️hey mate here is your answer ◀️◀️◀️
#️⃣Well,

You can first produce chloromethane by chlorination.

Then by wurtz coupling you can produce ethane.

Now again, by a substitution, Halo ethane and convert to alcohol and dehydrate it giving ethene.

Now chlorinate or brominate with excess halogen to get 1,1,2,2- tetrahalo derivative and then dehalogenate it.

You will now get acetylene. Trimirize it to get benzene.

CH3-H + X2 = CH3X + HX

2CH3X + 2Na = CH3-CH3 + 2NaCl in diethyl ether

CH3-CH3 + X2 = CH3CH2X + HX

Generally getting monosubstituted derivatives by direct halogention is difficult. ButI think it is okay if you don't get in this case as we have to eliminate them later.

CH3CH2X + NaOH = CH3CH2OH base hydrolysis

CH3CH2OH + H(+) = CH2=CH2 + H3O(+)

CH2=CH2 + exc X2 = X2CH-CHX2

X2CH-CHX2 + 2Zn = C2H2 + 2ZnX

3C2H2 heated at 800°C gives benzene by cyclization.

Note: the halogenations are theoretically possible. In practice you may get many products. These reactions will lead you to benzene on paper but not in practice as the halogenations may be complicated.#️⃣
▶️▶️Hope it will help you pls mark it as a brainlist answer ◀️◀️