Question

The IUPAC name of the following compound is \[ethenylbenzene\] .

a.True
b.False

Answer 1

Hint: The given compound is a benzene derivative with the formula \[{C_6}{H_6}CH = C{H_2}\]. The IUPAC name of the given compound can be found out by correctly naming the substituent. Since there is only substituent and no other functional groups, there is no need for priority orders and assigning positions.

Complete answer:
The IUPAC nomenclature refers to the systematic method of naming chemical compounds given by the International Union of Pure and Applied Chemistry.
The major rules used in naming organic compounds can be written as follows:
1.Find the longest carbon chain that consists of the maximum number of carbons arranged in a straight chain or ring which is called the parent chain.
2.Assign priorities to various functional groups and substituents attached to the parent chain.
3.The priorities of substitutes are based on the alphabetic order of their names.
4.Mention the positions occupied by each functional group or substituent in compound.
5.The naming is done from a side which assigns the lowest positions to all groups attached.
The given organic compound contains a six-membered aromatic ring named benzene. Hence the parent chain in the given organic compound will be benzene and the naming will be done according to it.
With a single substituent there is no need for prioritizing groups and assigning them positions.
The given substituent two-membered compound of the alkene family. Alkenes when added as substituents are named \['alkenyl'\] . A prefix \['eth'\] is used to indicate the presence of two carbons. Hence, the substituent is named \['ethenyl'\] .

Therefore, the given statement is true and the IUPAC name of the compound is \[ethenylbenzene\].

Note:
Organic compounds can have more than one IUPAC name that are difficult to write with the given set of rules. The given benzene derivative is popularly known as Styrene which is also an IUPAC name of the same compound and is not based upon the simple rules of IUPAC nomenclature.