Question

Which of the following compounds is insoluble even in hot concentrated ${H_2}S{O_4}$ ?
A.Benzene
B.Hexane
C.Aniline
D.Ethylene

Answer 1

In this question first we will learn about compounds that are soluble and insoluble in a highly concentrated acid like ${H_2}S{O_4}$. Then we will learn about polar, non-polar compounds and also about paraffins.

Complete step by step answer:
Hexane is an alkane which is additionally called as paraffin or less reactive. In this manner they are not solvent in concentrated ${H_2}S{O_4}$.
Likewise, hexane is nonpolar and concentrated ${H_2}S{O_4}$ is polar, in this way hexane isn't solvent in ${H_2}S{O_4}$ .
What are polar and nonpolar substances?
Nonpolar particles will be symmetric, which means all of the sides around the focal particle are indistinguishable - attached to a similar component with no unshared sets of electrons.
Polar compounds are unbalanced, either containing lone pairs of electrons on a central atom or having molecules with various electronegativities bonded. A polar compound is an atom wherein one finish of the particle is marginally certain, while the opposite end is somewhat negative.
What are Paraffins?
Paraffins, otherwise called alkanes, are saturated compounds that have the overall formula ${C_n}{H_{2n + 2}}$ , where n is the quantity of carbon ions. The least complex alkane is methane $(C{H_4})$ which is likewise represented as ${C_1}$.
Normal paraffins (n-paraffins or n-alkanes) are unbranched straight-chain particles. Every individual from these paraffins contrasts from the following higher and the following lower part by a $- C{H_2} -$bunch called a methylene group.
And hence option D is the correct answer.

Note:
To solve the above question one needs to know in depth about the paraffins, polar and non-polar substances and their reactions with concentrated ${H_2}S{O_4}$. They need to know how the paraffins act and don't dissolve in even a highly concentrated acid like ${H_2}S{O_4}$.