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Question
Arrange the following inthe decreasing order of their boiling points :
I. C9H20
II. C8H18
Arrange the following inthe decreasing order of their boiling points :
I. C9H20
II. C8H18
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Solution
The correct option is A (I) > (II) > (III) > (IV)
The boiling point in alkane depends upon the chains of atoms and the molecular mass of the molecules.
Straight-chain molecules have higher boiling point than the branched-chain compounds. This is beacuse intermolecular forces (often called van der Waal's forces) depend on attractions caused by quantum fluctuations in the surface electrons of the molecule. The larger the surface area, the more opportunity for such attractions to exist and therefore a stronger force. Thus boiling point decreases with branching and increases with molecular weight.
The order of boiling points :I>II>III>IV
The boiling point in alkane depends upon the chains of atoms and the molecular mass of the molecules.
Straight-chain molecules have higher boiling point than the branched-chain compounds. This is beacuse intermolecular forces (often called van der Waal's forces) depend on attractions caused by quantum fluctuations in the surface electrons of the molecule. The larger the surface area, the more opportunity for such attractions to exist and therefore a stronger force. Thus boiling point decreases with branching and increases with molecular weight.
The order of boiling points :I>II>III>IV
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