Writing the Structural Formula

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Sanjita Gowda 3C
Posts: 16
Joined: Fri Sep 25, 2015 3:00 am

Writing the Structural Formula

Postby Sanjita Gowda 3C » Sat Feb 27, 2016 11:07 am

On self test 1.7 A (b) in the intro to organic chemistry book, it asks to write the structural formula for 4-methyl-1-pentyne. The answer starts naming the molecules from the left side because when numbering the carbons you start from the left because the triple bond is closest to that side and thus has the lowest number when numbered in this way. My question is that whenever we write structural formulas, do we write them in the direction that we number?

So if the correct answer to 1.7A (b) is CHCCH2CH(CH3)CH3, would CH3CH(CH3)CH2CCH not be correct because it is written starting from the side that is not closest to the triple bond?

Ronald Yang 2F
Posts: 86
Joined: Fri Sep 25, 2015 3:00 am

Re: Writing the Structural Formula

Postby Ronald Yang 2F » Sat Feb 27, 2016 12:00 pm

The orientation wouldn't matter in this case, because whether you start counting from the right or left of that condensed formula doesn't change the numbering specified in the formula. So, both are correct.

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