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
%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.