[zain]

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

[Donaldson Tan]

Your question is very vague.

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

Define straight compounds

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

Do you include aromatic compounds in your cyclic compounds?

[english]

I think by "straight" he means unbranched.