The C-H bond distance is longest in: i) C₂H₂ ii) C₂H₂Br₂ iii) C₂H₄ iv) C₂H₆

Answer: Option (d) C₂H₆

Explanation

Bond length decreases with an increase in bond multiplicity. The higher the s character implies that the electrons, which are bonded pairs, are closely held together. This gives that the bond length is small and stronger the bond. So, sp has the least bond length; it is the strongest. sp3 has the longest bond length and weakest. It is the strongest. The hybrid orbitals of carbon involved in overlapping with its orbital of hydrogen that is sp3.

• The distance between two atoms participating in a bond, known as the bond length, can be determined experimentally.
• Bond distance is the average distance between nuclei of two bonded atoms in a molecule.