Question

What is compound A.

$(i)$ Succinic acid
$(ii)$ Adipic acid
$(iii)$ Oxalic acid
$(iv)$ Malonic acid

Answer 1

Potassium permanganate is an oxidising agent. When a multiple bond structure reacts with potassium permanganate, the oxidation of the multiple bond takes place. Further when it is used in acidic medium, then addition of ${H^ + }$ takes place with the oxidised product.

Complete answer:
Potassium permanganate is one of the strong oxidising agent which is used to oxidize the given hydrocarbon. For the oxidation of multiple bond structure, potassium permanganate is preferably used. Thus the reaction known as oxidation reaction. The oxidation of Cyclo-hexene takes place in two steps which are as follows:
$(i)$ Potassium permanganate will attack on the double bond of the Cyclo-hexene. Thus it form a complex with the given organic compound. Finally we get the below oxidised product as the main product of the oxidation.

The above product formed is oxidised product since it contain oxygen atoms.
$(ii)$ Now the oxidised product is so formed which will undergoes protonation with the help of water molecule. Therefore when oxidation of the compound takes place in acidic medium then the following reactions takes place.

The aldehyde which is formed is again oxidised to carboxylic acid due to excess of potassium permanganate. Thus the final product of the reaction is a adipic acid.

Note:
The aldehyde got converted into carboxylic acid upon oxidation. Also alcohol got converted into aldehyde upon oxidation. The reduction of aldehyde produces alcohol. Potassium permanganate is a strong oxidising agent which can oxidize aldehyde to carboxylic acid. The addition of oxygen to a molecule is also termed as oxidation of a given molecule.