Question

Which of the following represents the correct IUPAC name of the compound $C{{H}_{2}}=CH-C{{H}_{2}}Cl$?
A. Allyl chloride
B. 1-chloro-3-propene
C. 3-Chloro-1-propene
D. Vinyl chloride

Answer 1

Hint: IUPAC gives us some rules for the naming of organic compounds which can also be referred to as nomenclature of organic compounds. IUPAC stands for International Union of Pure and Applied Chemistry.

Complete answer:
IUPAC nomenclature gives us information about writing the name of chemical compounds. There are some general rules for it. To write the name of this compound we first know about the chemical formula of which is given $C{{H}_{2}}=CH-C{{H}_{2}}Cl$ and now to write IUPAC name we have to follow some rules.
a. At first select the longest chain of carbon atoms, in the given compound the longest chain is of 3 carbon atoms from left to right.
b. Now we see there is a chloro group present in the compound on the third carbon atom. We will start the numbering from the left hand side as conjugation is more effective as compared to chloro group so numbering should start from left to right.
c. In the given compound we can also see unsaturation i.e. presence of double bond in the compound at position 1st.
d. Given compound contain 3 membered carbon chain known as propane unsaturation is present on position 1 so it will be written in the form of 1-ene and chloro atom give the suffix chloro so the name will be:

3-Chloro-1-propene, option C is the correct answer.

Note:
The main aim of the nomenclature IUPAC is to create an international standard for designating compounds to promote communication. The purpose of the system is to give a unique and unambiguous name to each structure so that no two structure names get mixed or they can be identified easily.