Question

Which organic structure among the following is not an isomer of the compound? $C{H_3} - CO - C{H_2}C{H_2}C{H_2}C{H_3}$
(A) $C{H_3}C{H_2}OCH = CHC{H_2}C{H_3}$
(B) $C{H_3}CH = CHC{H_2}C{H_2}CHO$
(C) ${\left( {C{H_3}} \right)_2}CH - CO - C{H_2} - C{H_3}$
(D) $C{H_3}C{H_2}COC{H_2}C{H_2}C{H_3}$

Answer 1

This question gives the knowledge about the isomers. The compounds consisting of the same molecular formulas but containing different structures are isomers. Isomers play an important role in air pollution chemistry.

Complete step by step answer
The molecular formula is the representation of chemical compounds. It comprises the chemical symbols for the elements tailed by the numeric subscripts labelling the atoms of each element present in a molecule.
Consider the given molecule $C{H_3} - CO - C{H_2}C{H_2}C{H_2}C{H_3}$ . The molecular formula of this molecule is ${C_6}{H_{12}}O$ .
Among all the four options there is only one molecule that is there with the different molecular formula. $C{H_3}CH = CHC{H_2}C{H_2}CHO$ is the molecule with different molecular formulas. The molecular formula of this molecule is ${C_6}{H_{10}}O$ .

Therefore, option $B$ is correct.

Additional Information
The compounds consisting of the same molecular formulas but containing different structures are known as isomers. Isomers play a crucial role in air pollution chemistry, as even a little change in the structure can cause very dramatic change in chemical and physical properties.
There are two types of isomers. Types of isomers are as follows:
$1$ . Structural isomerism
$2$ . Stereoisomerism
Structural isomerism is also known as constitutional isomerism in which the difference occurs only in the position of bonds.
Stereoisomerism is also known as spatial isomerism in which the difference only occurs in the positions of atoms.

Note
Always remember that isomers play an important role in air pollution chemistry. Isomers play a crucial role in air pollution chemistry, as even a little change in the structure can cause very dramatic change in chemical and physical properties.