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Question
Among the following select the alkane that is expected to have lowest boiling point.
Among the following select the alkane that is expected to have lowest boiling point.
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Solution
The correct option is D 2,2-dimethylbutane
As the number of carbon atom increases, the boiling points of alkane increases because van der waal's forces increases.
Howerver, branching result in decrease in boiling point due to decreased surface area which results in weaker van der waal's forces.
Thus, order of boiling points of given alkanes is hexane > 2-methylpentane > 3-methylpentane > 2,2-dimethylbutane
CH3−CH2−CH2−CH2−CH2−CH3Hexane>CH3−CH2−CH2−CH(CH3)−CH32-methyl pentane>
CH3−CH2−CH3|CH−CH2−CH33-methyl pentane>CH3−C(CH3)2−CH2−CH32,2-dimethyl butane
Option D is correct.
As the number of carbon atom increases, the boiling points of alkane increases because van der waal's forces increases.
Howerver, branching result in decrease in boiling point due to decreased surface area which results in weaker van der waal's forces.
Thus, order of boiling points of given alkanes is hexane > 2-methylpentane > 3-methylpentane > 2,2-dimethylbutane
CH3−CH2−CH2−CH2−CH2−CH3Hexane>CH3−CH2−CH2−CH(CH3)−CH32-methyl pentane>
CH3−CH2−CH3|CH−CH2−CH33-methyl pentane>CH3−C(CH3)2−CH2−CH32,2-dimethyl butane
Option D is correct.
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