Chemistry Forum

Boiling point and melting point:
The minor difference between the electronegativities of hydrogen and carbon means that the bond between both of them is only weakly polar. If two alkanes having the same molecular weights are there then the highly branched one will have the lower boiling point. The melting point of aliphatic hydrocarbons increases with size but in a less regular manner.

Using above information, arrange the following compounds in ascending order of their boiling points:
1) Petroleum
2) Ponasterone A
3) Ecdysone

What is the answer to this question?

Petroleum is a mixture of different carbon hydrates, the boiling points are low.
The other both have realy high values 488 - 640 ° C

Can befind in google
Ecdysone Property
Melting point:: 242°C
alpha : 20578 +62°
Boiling point:: 488.1°C (rough estimate)
Density : 1.0493 (rough estimate)
refractive index : 1.4482 (estimate)
storage temp. : 2-8°C
pka: 14.07±0.70(Predicted)
Merck : 13,3525
BRN : 2422986
CAS DataBase Reference: 3604-87-3(CAS DataBase Reference)



PONASTERONE A Property

Melting point: :259-260° (dec)
alpha :D₁₅ +90° (methanol)
Boiling point: :640.5±55.0 °C(Predicted)
Density :1.22±0.1 g/cm3(Predicted)
storage temp. :−20°C
pka :14.13±0.70(Predicted)
form :White to off-white powder.
InChIKey :PJYYBCXMCWDUAZ-JJJZTNILSA-N
CAS DataBase Reference :13408-56-5(CAS DataBase Reference)
FDA UNII :84986BG₃NG

Very detailed answer, Thank you.