Respuesta :
Explanation:
Strength of intermolecular forces depends on the number of carbon atoms present in a compound. More is the number of carbon atoms attached linearly to each other more will be the surface area occupied by it. Hence, more is the strength of the compound.
This means that more is the branching present in a compound or lesser is the number of carbon atoms present in it then less will be the strength of intermolecular forces in the compound.
Thus, we can conclude that given compounds are placed in order of decreasing strength of intermolecular forces as follows.
[tex]CH_3CH_2CH_2CH_2CH_2CH_3[/tex] > [tex](CH_3)_3CCH_2CH_3[/tex] > [tex](CH_3)_3CCH_3[/tex]
The decreasing order of intermolecular forces is I>III>II, that is, CH₃CH₂CH₂CH₂CH₂CH₃>(CH₃)₃CCH₂CH₃>(CH₃)₃CCH₃.
• One of the ways of measuring the intermolecular forces is the boiling point.
• The compounds exhibiting stronger intermolecular forces, less branching, and larger masses exhibits higher boiling points.
• Therefore, boiling points is directly proportional to the intermolecular forces.
• The boiling points of the compounds i) CH₃CH₂CH₂CH₂CH₂CH₃ or hexane is 69 degree C, (ii) (CH₃)₃CCH₃ or neopentane is 10 degree C, and (iii) (CH₃)₃CCH₂CH₃ or 2,2-dimethylbutane is 50 degree C.
Thus, the decreasing order of intermolecular forces is i>iii>ii or CH₃CH₂CH₂CH₂CH₂CH₃>(CH₃)₃CCH₂CH₃>(CH₃)₃CCH₃.
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