Question

1 4-dimethylbenzene on heating with anhydrous alcl3 and hcl produces

Answer 1

Answer:

1 4-dimethylbenzene on heating with anhydrous alcl3 and hcl produces 1,3- dimethylbenzene.

Explanation:

1,4-dimethylbenzene contains electron donating groups (-CH3) which increases the nucleophilicity of the carbon atom in the presence of anhydrous AlCl3 and HCl. This reaction is called Gattermann Koch reaction. In this reaction aromatic hydrocarbon compounds are formylated by a mixture of HCN and HCl in the presence of AlCl3. Gattermann Koch reaction starts with the formation of the reactive species with the help of the acid.

Answer 2

Hey Dear,

● Answer -

1,3-dimethylbenzene

● Explanation -

Alkanes on heating with anhydrous AlCl3 & conc.HCl at 373 K & 30 atm undergo iosomerization to form some different alkane.

1,4-Dimethylbenzene on heating with anhydrous AlCl3 and HCl isomerises to form 1,3-dimethylbenzene.

Ph-1,4(CH3)2 + (AlCl3 & HCl) --> Ph-1,3(CH3)2

* 1,4-Dimethylbenzene => para-xylene

* 1,3-Dimethylbenzene => meta-xylene

Hope this helped you.