Question

Give the common names of the following compounds which have been named according to the IUPAC system of nomenclature.
Ethanoyl chloride

Answer 1

Hint: The naming of the compounds is based on two ways. One is the IUPAC naming and another is a common name which we use on a day to day basis. The IUPAC naming is different and the common name will be different for the given compound.

Complete step by step answer:
We have been given ethanoyl chloride which is an acid chloride. The IUPAC naming has been done according to the set of rules prescribed by IUPAC. The rules are as follows:
The longest carbon needs to be identified by the parent chain. Then we need to find the substituents which are different from the parent chain.
The numbering is from that end where it gives the lowest number to the substituent. The lowest locant is followed in this process.
In case multiple substituents occur more than once then the location of each point on which it occurs is given. Besides, the number of times the substituent has occurred needs to be mentioned. by di, tri, tetra etc.
For an equal number of parent chains, we select the parent according to the change which has the highest number of parent chains, the chain which has least branched side chains. Also when cyclic rings are present then the prefix cyclo is used. For more than one ring the term bicyclo is used.
Now, these are the rules for the naming of compounds using IUPAC nomenclature. The naming of the compound with ethanoyl chloride. It has two carbons and an acid chloride is present. So the prefix will be used as acetyl for two carbons.
So the common naming of ethanoyl chloride is acetyl chloride.

Note: The IUPAC system of naming is followed worldwide. It is a standard way of naming compounds. For the naming of bicyclic compounds which are between two fixed carbons, there are different sets of rules.