Question

Alicyclic compounds are:
A. Aromatic compounds
B. Aliphatic cyclic compounds
C. Heterocyclic compounds
D. None of the above

Answer 1

We all know that an alicyclic compound contains one or more all-carbon rings which may be either saturated or unsaturated, but do not have aromatic character. Also, alicyclic compounds may have one or more aliphatic side chains attached.

Complete step by step answer:
We have to remember that alicyclic compounds may have one or more aliphatic side chains attached. The simplest alicyclic compounds are the monocyclic cycloalkanes: cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, and so on. Bicyclic alkanes include bicyclo undecane, decalin, and housane.
We also know that an alicyclic compound is an organic compound that is both aliphatic and cyclic. They contain one or more all-carbon rings which may be either saturated or unsaturated, but do not have aromatic character. Alicyclic compounds may have one or more aliphatic side chains attached. Therefore we can conclude that alicyclic compounds are aliphatic cyclic compounds. Therefore, the option B is correct.
When we refer to aliphatic cyclic compounds we know that they are also known as non-aromatic compounds. Aliphatic compounds can be cyclic or not, but only aromatic compounds contain a stable ring of atoms, such as benzene. Open-chain compounds are either straight or branched. They contain no rings of any type, and are thus called aliphatic.

Therefore, the option B is correct.

Note: We need to remember that an aromatic compound is a large class of unsaturated chemical compounds characterized by one or more planar rings of atoms joined by covalent bonds of two different kinds. And heterocyclic compounds or ring structure is a cyclic compound that has atoms of at least two different elements as members of its rings. Heterocyclic chemistry is the branch of organic chemistry dealing with the synthesis, properties, and applications of these heterocycles.