Answer:
I am confused by your question. is the compound's correct name is really a cycloalkane? But in your given direction, it is told to examine the cycloalkene.
but anyways, if the coimpound is really a cyclopentene, then
- it will not be named as 1-methyl-3-ethylcyclopentene since according to the nomenclature of cycloalkenes you have to arrange the name in alphabetical order using the full name, you must include the prefixes like di-, tri-. so in this case, ethyl shoud go first instead of methyl.
next, why not 5-ethyl-2-methylcyclopentene, even if is an alphabetocal order, again, according to IUPAC rules. you will have to name the chain starting with the nearest or smallest number of substituents. Examining the correct cycloalkene, you will observed that there is only 1 carbon in between the carbons with substituents,, we have Carbon 1, Carbon 2 and Carbon 3 .
but if you will try to look at the structure of 5-ethyl-2-methylcyclopentene, you will notice that there is 4 carbon difference between the substituents,
