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Catenation

Which pairs o...

Question

Which pairs of compounds will form the strongest hydrogen bonds with each other?

A

C_{2} H_{5} O H

and

C H_{3} O C H_{3}

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B

H O C H_{2} C H_{2} O H

and

H_{2} O

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C

H O C H_{2} C H_{2} O H

and

C H_{3} O H

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D

C H_{3} O C H_{3}

and

H_{2} O

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Solution

The correct option is D $H O C H_{2} C H_{2} O H$ and $C H_{3} O H$
$H O C H_{2} C H_{2} O H$ and $C H_{3} O H$ will form the strongest hydrogen bonds with each other.
A hydrogen bond is formed when a $H$ atom is attached to electronegative $N, O$ or $F$ atom.
In alcohols, oxygen is more electronegative than hydrogen atom as well as alkyl group produces polarity in $O - H$ bond.
Hence, the option (C) is the correct answer.

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Question 04

Hydrogen bonds are formed in many compounds e.g., $H_{2} O, H F, N H_{3}$ . The boiling point of such compounds depends to a extent on the strength of hydrogen bond and the number of hydrogen bonds. The correct decreasing order of the boiling points above compounds is

(a) $H F > H_{2} O > N H_{3}$

(b) $H_{2} O > H F > N H_{3}$

(c) $N H_{3} > H F > H_{2} O$

(d) $N H_{3} > H_{2} O > H F$

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