Question

AL5. Which is the IUPAC name for the following compound? Hас CH3 CH2CH3 A) 3-ethyl-6,6-dimethyl-1,4-cyclohexadiene B) 1,1-dimethyl-4-ethyl-2,5-cyclohexadiene C) 4,4-dimethylethylebenzene D) 1-ethyl-4,4-dimethyl-2,5-cyclohexadiene E) 6-ethyl-3,3-dimethyl-1,4-cyclohexadiene

Why is the answer E even though when I tried it I got the answer as A
please explain it clearly to why the answer is E with all the rules explained for it

Answer 1

order of periority of functional groups

carboxylic acid > carboxylic acid derivatives >nitriles>aldehyde > ketones>alcohol>amine>alkene> alkyne>alkane>substituents

Lowest sum rule : The numbers are given to carbon atoms in it from left to right or right to left stating from 1 so that on adding the number of all carbon atoms at which substituents and functional groups are present ,it should give the lowest sum possible .

Ofez CH3 lowest sum rule 1+3+3 +4 +6 = 17 iris correct order CH-CH3 tcrz 134 CH₂-Chle 1+3+4 +676 = 20 it is wrong selection. it is not follow the lowest sum rue. CH3 CH3 I lls yo Cry-Chs E. 6-ether - 3,3-dimethyl-2, 4-Cyclo hexadiene.