[INeedSerotonin]

Five bottles with reagents, numbered from 1 to 5, have liquids with the general formula C(n) H(2n+2), in which 5 <= n <= 9.

It is known that these have a normal chain, and the respective boiling points are the following:

Bottle 1 --> 36°C
Bottle 2 --> 151°
Bottle 3 --> 98°C
Bottle 4 --> 126°C
Bottle 5 --> 69°C

With these informations, we can affirm that the liquid in Bottle 4 is the...

a) n-octane <---- this one is the correct one
b) n-nonane
c) n-heptane
d) n-pentane
e) n-hexane

Can you guys please shed me some light here?

[Borek]

Is there any dependency between chain length and the boiling point?

[INeedSerotonin]

Is there any dependency between chain length and the boiling point?

Yes, there is! The chain length is directly proportional to the boiling point, and ramifications are inversely proportional to it.

So I have to unscramble and put everything in order! I think I've understood now. Thanks!