Answer:
Due to sp-hybridization of carbon,
the electrons of the C?H bond of ethyne are attracted towards carbon. As a
result, carbon carries a partial negative charge while H carries a partial
positive charge. Because of the presence of partial charge on H, ethyne forms
H-bond with the F-atom of the HF molecule as shown:
\[H-C\equiv \overset{\delta
-}{\mathop{C}}\,-\overset{\delta +}{\mathop{H}}\,......\overset{\delta
-}{\mathop{F}}\,-\overset{\delta +}{\mathop{H}}\,\]
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