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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

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    $\begingroup$ Before you ask "why", ask "if". $\endgroup$ – Ivan Neretin Jul 22 '17 at 6:30
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    $\begingroup$ perhaps you can give some examples to support your question? $\endgroup$ – porphyrin Jul 22 '17 at 6:47
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    $\begingroup$ Pretty sure phi bonds don't figure in $C-C$ or $C=C$ bonds... $\endgroup$ – paracetamol Jul 22 '17 at 7:41
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    $\begingroup$ You need to make up your mind whether $\ce{C#C}$ or $\ce{C=C}$ bonds are shorter. $\endgroup$ – orthocresol Jul 22 '17 at 9:02
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%s character of sp hybridised orbital is 50% and of sp2 it's 33%. More S-character means that the shared electron pair is closer to the carbon nucleus making it stronger and shorter.

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