The pair of molecules forming strongest hydrogen bonds are:

S i H_{4}

and

S i F_{4}

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C H_{3} C O C H_{3}

and

C H {C l}_{3}

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C H_{3} C O O H

and

H C O O H

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H_{2} O

and

H_{2}

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Solution

The correct option is C $C H_{3} C O O H$ and $H C O O H$

A) $S i H_{4}$ and $S i F_{4}$ have following bond polarisation
Since both have same kind of polarisation. No effective $H -$ bonding.

C) So here strong $H -$ bonding is present between ${C H}_{3} C O O H$ and $H C O O H$ .

Answer is $C$ .

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The pair of molecules forming strongest hydrogen bonds are:

The correct option is C CH3COOH and HCOOHA) SiH4 and SiF4 have following bond polarisationSince both have same kind of polarisation. No effective H− bonding.C) So here strong H− bonding is present between CH3COOH and HCOOH.Answer is C.