Question

Cycloalkanes are isomeric with:
A. Alkanes
B. Alkenes
C. Alkynes
D. Arenes

Answer 1

The word isomer is derived from two Greek words called iso + mer where iso means equal and mer means parts i.e. equal parts. Isomers are defined as those compounds which have the same chemical formula but different arrangement of molecules and the phenomenon of isomers is known as isomerism.

Complete answer:
Cycloalkanes are also known by the name naphthenes but it is not similar with naphthalene; these are generally known as monocyclic saturated hydrocarbons. Cycloalkane can also be described as a compound which consists only of hydrogen and carbon atoms arranged in a structure containing a single ring and all of the carbon-carbon bonds are single.
On the basis of IUPAC nomenclature, where IUPAC stands for International Union of Pure and Applied Chemistry it defines that cycloalkanes include those saturated hydrocarbons which are polycyclic in nature. In general form the chemical formula represented for cycloalkanes can be shown as ${{C}_{n}}{{H}_{2(n+1-r)}}$ where n is the number of carbon atoms are r is the number of rings present in the compound. The simplest form can be defined as ${{C}_{n}}{{H}_{2n}}$.
Now out of all the options we know that the chemical formula of alkene is also ${{C}_{n}}{{H}_{2n}}$ so we can say that cycloalkanes are isomeric with alkenes.

Thus option B is the correct answer.

Note:
Alkenes are basically those compounds which have saturation in those i.e. presence of double bond in the compound, whereas alkanes are those which have single bond in them, alkynes contain triple bonds with them whereas arenes are aromatic compounds.