Quiz 3 Preparation # 2

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Ranger Saldivar 2D
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Joined: Fri Sep 25, 2015 3:00 am

Quiz 3 Preparation # 2

Postby Ranger Saldivar 2D » Sun Feb 28, 2016 8:53 pm

On the first Quiz 3 Preparation for number 2 why is it 2,2,4-trimethyl-3-ethylpentane instead of 3-ethyl-2,2,4-trimethylpentane. Also how do you detemine if the trimethyl has 2,2,4 instead of 2,4,4?

Allen Guo 4A
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Joined: Fri Sep 25, 2015 3:00 am

Re: Quiz 3 Preparation # 2

Postby Allen Guo 4A » Sun Feb 28, 2016 9:31 pm

Even though t comes before e in the alphabet, most prefixes are ignored in alphabetization, and ethyl comes before ethylpentane. If you compare 2 2 4 to 2 4 4, the first 2 is equal to the first 2 of the second scheme, but the first naming scheme's second digit, 2, is lower than the second digit of the second naming scheme, 4.

Ranger Saldivar 2D
Posts: 28
Joined: Fri Sep 25, 2015 3:00 am

Re: Quiz 3 Preparation # 2

Postby Ranger Saldivar 2D » Sun Feb 28, 2016 9:34 pm

Even if I ignore the t in trimethyl the e in ethyl comes before the m in methyl so shouldnt ethyl be named first?

Derek Li--Dis1a
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

Re: Quiz 3 Preparation # 2

Postby Derek Li--Dis1a » Mon Feb 29, 2016 10:25 am

Yeah I think it should be 3-ethyl-2,2,4-trimethrylpentane.

Can any of you guys explain what the parentheses mean? Also, how did you guys know it was a pentane molecule, not a hexane molecule with 4 methyls?


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