35. M/J 2014/P11/Q36
Which statement about the properties of propane and hexane is correct?
A Propane has a higher boiling point than hexane.
B Propane has a higher relative molecular mass than hexane.
C Propane has more isomers than hexane.
D Propane is more flammable than hexane.
Answer: D
Explaination
The chemical properties of all alkanes are same because of same general formula. Their physical properties generally increases like boiling point, melting point, viscosity, molecular masses because of increase intermolecular forces among.
Propane has 3C whereas hexane has 6C. so molecular mass, boiling point, melting point, viscosity increases as the chain becomes longer but the flammability decreases as molecular mass increases and produce more smoke.
Examples:
Diesel, petrol (heavier gas)
Methane gas (lighest gas) increase flammability
