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  4. Which one of the following has longest covalent bond distance?

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Q. Which one of the following has longest covalent bond distance?

EAMCETEAMCET 2014

Solution:

The average distance between the centre of nuclei of the two bonded atoms in a molecule is known as bond length. It depends upon the size of atoms, hybridisation, steric effect, resonance etc.
Usually bond length of polar bond is smaller as compared to a non-polar bond. Therefore, $C - C$ bond length is longest among given options.