HCI cannot form $H_{2} {Cl}_{2}$ while HF can form $H_{2} F_{2}$ . The reason is

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Fluorine atom is small and can form hydrogen bonds

Chlorine has large size and more E.N than fluorine

Fluorine is more reactive

HF is more reactive

answer is C.

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Detailed Solution

More electronegative atom such as N, O and F form hydrogen bonding .where as HCl can't form due to large size of Cl ,thus HF can form hydrogen bonding.

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