Question

Compound A which is a good solvent converted into compound B is unsaturated hydrocarbon in presence of dehydrating agent. Identify A and B, and write a chemical equation.

Answer 1

Unsaturated hydrocarbon means the compound is only having carbon and hydrogen atoms, and there is either a double bond or a triple bond in it. A dehydrating agent is used to remove water molecules from the compound.

Complete answer:
A solvent is the part of the solution which is used to dissolve solute in it and it is in a larger amount.
Unsaturated hydrocarbon means the compound is only having carbon and hydrogen atoms, and there is either a double bond or a triple bond in it. A dehydrating agent is used to remove water molecules from the compound.
Given that compound A is a good solvent and it is dehydrated which means that there is a water molecule present in it. So, compound A will be ethanol.
Ethanol is an organic compound that belongs to the alcohol group and its formula is $C{{H}_{3}}-C{{H}_{2}}OH$. It is a good and versatile solvent. It is miscible with water and many other organic solvents.
When it is dehydrated, then there is the removal of a water molecule. This will form ethene which is an unsaturated hydrocarbon. The formula of ethene is $C{{H}_{2}}=C{{H}_{2}}$.
The reaction of dehydration of ethanol is given below:
$C{{H}_{3}}-C{{H}_{2}}OH\xrightarrow{-{{H}_{2}}O}C{{H}_{2}}=C{{H}_{2}}$

So, compound A is ethanol and compound B is ethene.

Note:
Some examples of dehydrating agents are concentrated sulfuric acid, concentrated phosphoric acid, aluminium oxide, hot ceramic, etc. Ethanol is also used for identifying other compounds.