# why bond length of double bond is less than that of triple bond? [closed]

why bond length of double bond is less than that of triple bond ? I came across this question many a times. I am confused because there is a sigma bond and two phi bond in triple bond and a sigma and phi bond in double bond. Hence bond length of both of them should be same. But it is not so. Ex :- Carbon Carbon triple bond length is shorter than C=C

• Before you ask "why", ask "if". – Ivan Neretin Jul 22 '17 at 6:30
• perhaps you can give some examples to support your question? – porphyrin Jul 22 '17 at 6:47
• Pretty sure phi bonds don't figure in $C-C$ or $C=C$ bonds... – paracetamol Jul 22 '17 at 7:41
• You need to make up your mind whether $\ce{C#C}$ or $\ce{C=C}$ bonds are shorter. – orthocresol Jul 22 '17 at 9:02