question_answer

Why HF forms H-bonding with ethyne even though it is non-polar in nature?

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: \[H-C\equiv \overset{\delta -}{\mathop{C}}\,-\overset{\delta +}{\mathop{H}}\,......\overset{\delta -}{\mathop{F}}\,-\overset{\delta +}{\mathop{H}}\,\]