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Question
Which of the following is the least volatile?
Which of the following is the least volatile?
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Solution
The correct option is D CH3−CH2−CH2−Br
Boiling point increases and volatility decreases with an increase in vanderwaal's interaction, which depends on the size/surface area of the molecule. For a given chain length of alkyl halide, the boiling point increases with the size of halides and follows the order as RF<RCl<RBr<RI. In case of isomers of the same compound, increased branching reduces the boiling point of the compound. Therefore the order of boiling point is:CH3−CH2−CH2−F<CH3−CH2−CH2−Cl<CH3CH|Br−CH3<CH3−CH2−CH2−Br and that of volatility is:CH3−CH2−CH2−F>CH3−CH2−CH2−Cl>CH3CH|Br−CH3>CH3−CH2−CH2−Br
Therefore option D is correct.
Boiling point increases and volatility decreases with an increase in vanderwaal's interaction, which depends on the size/surface area of the molecule. For a given chain length of alkyl halide, the boiling point increases with the size of halides and follows the order as RF<RCl<RBr<RI. In case of isomers of the same compound, increased branching reduces the boiling point of the compound. Therefore the order of boiling point is:
CH3−CH2−CH2−F<CH3−CH2−CH2−Cl<CH3CH|Br−CH3<CH3−CH2−CH2−Br
and that of volatility is:
CH3−CH2−CH2−F>CH3−CH2−CH2−Cl>CH3CH|Br−CH3>CH3−CH2−CH2−Br
Therefore option D is correct.
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