Name the structure ch3 ch2 ch ch ch2 ch3 ch3 ch ch2 ch3 ch3 using the iupac system. 1. 2,3-diethyl-4-methylhexane 2. 3-butyl-4-methyl-hexane 3. 4-ethyl-3,5-dimethylheptane 4. 3,5-dimethyl-4-ethylheptane

This, CH3 CH2 CH CH CH2 CH3 CH3 CH CH2 CH3 CH3, is not a proper structure.

I am going to restructure it the best it can be done from the information given.

CH3 CH2
         |
CH3 CH CH CH2 CH3
               |
      CH3 CH CH2 CH3

Now I am going to draw only the C of the main chain and place the  numbers to count the number of Cs in tha chain


 (1)  (2) 
  C  - C -
         |
   (3) C - C(4) -
               |
             - C - C - C -
             (5)   (6)  (7)  


Seven Cs => the compound is a heptane.

No you can see that there are three substitutes: one methyl group at the C number (3), one ethyl group at C number 4, and  one methyl group at the C number 5.

With that information, the product is named

4 - ethyl - 3, 5 dimethylheptane (which is the option number 3 of the list).

The ehtyl group is named before the methyl group to respect the alphabetical order, as per IUPAC rules.

Ok so co(g) is not pronoused that. the only clue is that youpronouse it the oppisote way.