Question

Given, ${C_7}{H_7}Cl$ shows how many benzenoid aromatic isomers?
A.$4$
B.$3$
C.$5$
D.None of these

Answer 1

The first thing will be looking at will be the basic structure of ${C_7}{H_7}Cl$ . Then we will know what the benzenoid aromatic isomers are. Then will explain how many isomers are shown by the ${C_7}{H_7}Cl$ . Then we will look onto some exciting notes about the topic.

Complete answer:
Step1. ${C_7}{H_7}Cl$ is called benzyl chloride. Its average mass is 127. It has a benzene attached with a methyl and chlorine attached to the benzene or once to that methyl carbon. Its basic structure is given below.
Stept2. Aromatic isomers is the type of positional isomers. It exists because the substitutes can be positioned at the different positions of the benzene ring.
Step3. Now we will look at the different structures of the benzyl chloride and then we will compare all the structures and we will find that there will be 4 different structures of it.
In one there will be a methyl chloride attached to one position. Later on the methyl will be attached to one position but the chloral substitute will go to the position of two, three and four. This will give us four different structures of the benzyl chloride.

Hence the Option A is the correct answer.

Note:
Isomers are compounds with the same chemical formulas but with different names and structure. They will show different chemical properties. There are two types of isomerism, structural and stereoisomerism. In structural isomers the constituent groups are positioned at different places. In stereo isomers there is the same position but different orientation of atoms.