$A = C_{2} H_{5} - O - C_{2} H_{5}$
$B = C H_{3} - C H_{2} - C H_{2} - C H_{3}$
$C = C H_{3} - C H_{2} - C H_{2} - C H_{2} - O H$
$D = C H_{3} - C H_{2} - C H_{2} - C H O$
Correct order of Boiling point is

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C > D > A > B

B > A > D > C

A > B > C > D

D > B > C > A

answer is C.

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Detailed Solution

B.P: - Alcohol > Aldehydes > Ether > Hydrocarbons

Reason: Alcohol forms strong H-bonding than aldehyde and ketones, also aldehyde has more boiling point than ether because of high polarity and at last, ether has more boiling point than hydrocarbon because in hydrocarbon there is only C and H.

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