Which of the following shows negative deviation from Raoult's law?

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$C_{6} H_{5} {CH}_{3}$ and $C_{6} H_{6}$

${CHCl}_{3}$ and ${CH}_{3} {COCH}_{3}$

$C_{6} H_{6}$ and ${CCl}_{4}$

${CHCl}_{3}$ and $C_{2} H_{5} OH$

answer is A.

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Detailed Solution

${CHCl}_{3} + {CH}_{3} {COCH}_{3}$

When acetone and chloroform are mixed together a hydrogen bond is formed between them which increases the inter molecular attraction between them and hence decreases the vapour pressure.That is experimental vapour pressure is less than the vapour pressure calculated by using the Raoult's law.

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