Quiz 3 Prep pg 43 question 5

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BrandonCooper2C
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Joined: Fri Sep 25, 2015 3:00 am

Quiz 3 Prep pg 43 question 5

Postby BrandonCooper2C » Mon Feb 29, 2016 7:02 pm

The answer says 3-bromo-1-iodocyclohexane, but I got 1-bromo-3-iodocyclohexane because I thought you are supposed to give the lower number to the first alphabetical substituent when the numbers are the same either way.

Please help.

Cindy Chen_2I
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Joined: Wed Nov 18, 2015 3:00 am

Re: Quiz 3 Prep pg 43 question 5

Postby Cindy Chen_2I » Mon Feb 29, 2016 7:05 pm

You give priority to the I because it has a larger atomic number.

Cindy Chen_2I
Posts: 43
Joined: Wed Nov 18, 2015 3:00 am

Re: Quiz 3 Prep pg 43 question 5

Postby Cindy Chen_2I » Mon Feb 29, 2016 7:09 pm

You give the lower number to the first alphabetical substituent only when the two substituents are connected by the same kind of atom. For example, in 1-ethyl-2-methylcyclopentane, you give the one to the alphabetically first substituent because they are both connected by a C atom (when you go down the side chain, the first thing you encounter is a C).

Cindy Chen_2I
Posts: 43
Joined: Wed Nov 18, 2015 3:00 am

Re: Quiz 3 Prep pg 43 question 5

Postby Cindy Chen_2I » Tue Mar 01, 2016 10:41 pm

Cindy Chen_2I wrote:You give priority to the I because it has a larger atomic number.

Oh I'm sorry they say the workbook gave the wrong answer, so your answer is correct as it is.


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