Question

The correct IUPAC name of the above given compound is.

A. m-bromoethylbenzene.
B. m-bromotoluene.
C. 1-bromo-3-methylbenzne.
D. 1-bromo-4-methylbenzene.

Answer 1

Hint: We know IUPAC terminology of natural mixes alludes to the precise methodology taken for the classification of natural mixes according to the proposal of the International Union of Pure and Applied Chemistry.

Complete step by step answer:
As per the Guidelines set by IUPAC, the terminology of mixes must follow these means:
The Longest Chain Rule: The parent hydrocarbon must be recognized and accordingly named. The parent affix having a place with the compound being referred to be commonly the longest chain of carbon molecules be it as a straight chain or a chain of some other shape.
The Lowest Set of Locants: The carbon molecules having a place with the parent hydrocarbon chain must be numbered utilizing characteristic numbers and starting from the end in which the most reduced number is doled out to the carbon iota which conveys the substituents.
Different examples of the equivalent substituent: Prefixes which show the complete number of the equivalent substituent in the given natural mixes are given, for example, di, tri, and so on
Naming of various substituents: In the natural mixes containing numerous substituents, the relating substituents are orchestrated in sequential request of names in the IUPAC terminology of natural mixes being referred to.
The naming of various substituents present at similar situations: In the situation wherein two varying substituent bunches are available at a similar situation of the natural compound, the substituents are named in climbing sequential requests.
Naming Complex Substituents: Complex substituents of natural mixes having spread structures must be named as subbed alkyl gatherings while the carbon which is joined to the substituent bunch is numbered as one. These extended and complex substituents must be written in sections in the IUPAC classification of the relating mixes.
The given compound is.

In the given compound bromine is substituted at the carbon one and the methyl group is substituted at third carbon in the benzene ring. Thus according to the nomenclature the name of the compound is 1-bromo-3-methylbenzene.
We can also draw the compound in given option as,

In the above drawn structures are not matched with the given structure. Therefore, the option A, B and D are incorrect So, the correct answer is “Option C”.

Note:
It must be noted that to predict whether the molecule shows geometric isomerism or not, one must know the fundamentals to draw the structure from its IUPAC name. Drawing the structure helps us to visibly locate the double bonds and whether different groups are present on either side of the bond. It is not possible to predict the type of isomerism by its IUPAC name alone.