The compounds $C_{3} H_{8}, {CH}_{3} {CH}_{2} OH$ and ${CH}_{3} {OCH}_{3}$ have very similar molar masses. When they are arranged in order of increasing strength of their intermolecular forces, what is the correct order?

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${CH}_{3} {CH}_{2} OH, C_{3} H_{8}, {CH}_{3} {OCH}_{3}$

$C_{3} H_{8}, {CH}_{3} {OCH}_{3}, {CH}_{3} {CH}_{2} OH$

${CH}_{3} {OCH}_{3}, C_{3} H_{8}, {CH}_{3} {CH}_{2} OH$

${CH}_{3} {CH}_{2} OH, {CH}_{3} {OCH}_{3}, C_{3} H_{8}$

answer is A.

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Detailed Solution

The compounds C₃H₈, CH₃CH₂OH, and CH₃OCH₃ have very similar molar mass. The increasing order of their intermolecular force is given as,

C₃H₈<CH₃OCH₃< CH₃CH₂OH

Thus, option A is correct.

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