Question
Give the correct decreasing order of $\mathrm{C}-\mathrm{H}$ bond, lengths in the molecule $\mathrm{C}_2 \mathrm{H}_6, \mathrm{C}_2 \mathrm{H}_4$ and $\mathrm{C}_2 \mathrm{H}_2$.
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Answer
This is because hybrid orbitals of carbon involved in overlapping with 1 s -orbital of hydrogen are $\mathrm{sp}^3, \mathrm{sp}^2$ and sp respectively and their sizes are in the order $\mathrm{sp}^3>\mathrm{sp}^2>\mathrm{sp}$.
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