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Q.

Which of the following is a liquid at room temperature

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a

${CH}_{3} I$

b

${CH}_{3} Br$

c

$C_{2} H_{5} Cl$

d

${CH}_{3} F$

answer is A.

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Detailed Solution

${CH}_{3} F, {CH}_{3} Cl, {CH}_{3} Br$ and $C_{2} H_{5} Cl$ are gases at room temperature.
${CH}_{3} I$ is a liquid at room temperature because of high molecular weight among all.
Higher the molecular weight, higher will be the vander waal's forces.
So, higher will be the boiling point.

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