Question

Nomenclature of

Answer 1

Hint: The general rules for a naming cyclic compound can help us solve this illustration effectively.
The rules for naming cycloalkenes are the same as for naming alkene with an exception as described below.
Complete step by step answer:
Let us first discuss the rules for naming the cyclic compounds;
Focusing on the naming rules for cycloalkenes as the compound mentioned above is a cycloalkene having a double bond and substituted alkyl group.
Cycloalkenes are named in the same way as open chain alkenes. But has an exception that the numbering will start at one of the carbons of the double bond. This is done to keep the index number to the minimum.
Now, let us see the rules;
1. Number the carbon atom in the ring such that the carbon 1 and carbon 2 will be the constituents of the double bond.
2. The lower number is given to the group or branch attached.
3. Name in alphabetical order.
So, now considering these rules and our given compound;
The cyclic compound is a six membered ring with ethyl group as the substituent. Thus,

The name of the given compound will be 3- ethyl cyclohexene.

Note: Do note to consider the exception as, without considering the same we will name the compound but will result in wrong nomenclature.
We can also name the same compound as 3- ethyl 1- cyclohexene.