The C-C bond length for ethyne is 1.20A which is shorter than ethane(1.54A)and ethene(1.33A) The C-H bond length in ethyne is 1.06A which is also shorter than in ethane (1.09A)or ethene(1.08A). This is because the C-H bond contains more s character(sp'->sp->sp)which gives stronger bonds. 1.54A 1.33A 1.20A H H H C≡C一H H H H 1.09 1.08A 1.06A ethane ethene ethyne Ch09 Alkynes (landscape) Page4 Ch09 Alkynes (landscape) Page 4 The C-C bond length for ethyne is 1.20Å which is shorter than ethane (1.54Å) and ethene (1.33Å). The C-H bond length in ethyne is 1.06Å which is also shorter than in ethane (1.09Å) or ethene (1.08Å). This is because the C-H bond contains more s character (sp3sp 2sp) which gives stronger bonds