Chemical Forums

Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: zain on May 19, 2007, 06:19:13 PM

Title: Alkanes and Stability
Post by: zain on May 19, 2007, 06:19:13 PM

I had an exam question that i came accross that i just couldn't find the answer to.
CH2 DHc per mole = -657kjmol-1 in straight compounds like C3H8, C5H12, C6H14
Whereas in cyclic compounds they're slightly higher (values were included)

so i was thinking perhaps its to do with ring strain?... but wouldn't that make them more stable for the larger ones?...
seeing as the highest value was for C3H6 which was -697?
if someone could help me that would be great
many thanks

Title: Re: Alkanes and Stability
Post by: Donaldson Tan on May 20, 2007, 12:14:51 PM

Your question is very vague.

Quote from: zain on May 19, 2007, 06:19:13 PM

CH2 DHc per mole = -657kjmol-1 in straight compounds like C3H8, C5H12, C6H14

Define straight compounds

Quote from: zain on May 19, 2007, 06:19:13 PM

Whereas in cyclic compounds they're slightly higher (values were included)

Do you include aromatic compounds in your cyclic compounds?

Title: Re: Alkanes and Stability
Post by: english on May 20, 2007, 12:27:10 PM

I think by "straight" he means unbranched.