Question

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Answer 1

Answer:

1 . when unsaturation increases then bond length decreases because the bond aquires more s character therefore it becomes more electronegative and cause bond length decrease

2. ethyne is more stable compound because it has smallest bond length and highest bond enthalpy

3. . when bond length decreases due to increase in unsaturation it means there is greater force of attractions between atom therefore more amount of energy is required to break such kind of bonds ( also number of bond increases theirfore the bond enthalpy increases)