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Abhijeet Gaurav Best Answer
See Bond length is inversely proportional to Bond strength or Bond stability. Here Single bond between C & H is very strong as both have small atom radii & formation of bond with H is through 1s which is very strong bond. Now the double bond between C & C has more bond length because they are through outer 2p orbital electrons which are less shielded than 1s-2p than 2p-2p bond. Thus the bond being much stronger between C- H than C=C.