Based on the molecular interactions, arrange the following hydrocarbons in the increasing order of their boiling...

Based on the molecular interactions, arrange the following hydrocarbons in the increasing order of their boiling points. Which of them will have maximum retention time in the gas chromatograph:

Benzene (C6H6), toluene (C6H6-CH3), Xylene (C6H4-(CH3)2)

Expert Solution

the molecular interactions that are present among non-polar molecules are vandewaal forces. These vanderwaal forces of attractions are directly proportional to the surface area of the molecules. Thus, the surface area increases in the order Xylene (C6H4-(CH3)2) > toluene (C6H5-CH3) > Benzene (C6H6) and the boiling points also increases in the same order Xylene (C6H4-(CH3)2)(144 oC) > toluene (C6H5-CH3) (110 oC) > Benzene (C6H6)(80 oC)

If a component has a low boiling point, then it is likely to spend more time in the gas phase. Therefore its retention time will be lower than a compound with a higher boiling point. Thus, Benzene has lowest retension time and o-xylene has highest rentension time.

queen_honey_blossom answered 2 years ago

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