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Hydrogen Bonding

Question

Strongest hydrogen bond is present in:
$C H_{3} O H$
$C H C l_{3}$
$[C H_{3}]_{2} C H O H$
$[C H_{3}]_{3} C O H$

A

[C H_{3}]_{2} C H O H

B

[C H_{3}]_{3} C O H

C

C H_{3} O H

D

C H C l_{3}

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Solution

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Greater electronegativity of the hydrogen bond acceptor will lead to an increase in hydrogen bond strength. In case of $C H_{3} O H$ , $(C H_{3})_{2} C H O H$ & $(C H_{3})_{3} C O H$ $C H_{3} O H$ has the strongest $H$ -bonding as the polarity of $- O H$ decreases due to $+ I$ effect in $(C H_{3})_{2} C H - O H$ & $(C H_{3})_{3} C - O H$ .
(Refer to Image)
$C H C l_{3}$ has lowest $H$ -bonding because $H$ is attached to less electronegative $C$ -atom.

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