covalent and ionic bonding...?

Question

Compare the bond length and bond energy of the carbon-carbon bonds in ethane (H3C-CH3), ethene (H2C=CH2), and ethyne (HC=CH). Arrange the compounds in order increasing both length and increasing bond energy.

Bond Length: ---------------------<-----------------------<---------

Bond energy ----------------------< -------------------------<

Answer 1

Length: yne, ene, ane.
Energy: ane, ene, yne.