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Bond Order and Enthalpy

Which of the ...

Question

Which of the following bonds has the highest bond energy?

C - C

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C \equiv C

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C = C

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C - H

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Solution

The correct option is B $C \equiv C$
Bond energy depends on the bond order i.e., the number of covalent bonds formed between two atoms.
Since, $C \equiv C$ has 3 covalent bonds, hence this bond has highest energy. Also, $C - H$ bond is stronger than $C - C$ bond because of better overlap between carbon and hydrogen $(s p^{3} - s overlap)$ in $C - H$ as compared to $C - C$ bond $(s p^{3} - s p^{3} overlap)$ .
Hence, order becomes: $C \equiv C > C = C > C - H > C - C$ .

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Similar questions

Which one of, the following bonds has the highest average bond energy (kJ/mol)?

* C - H

C - X

C - B r

C - C l

C - F

C - I

C - H_{a}

H | C | H = H | C | H + H - H \to H - H | C | H - H | C | H - H

H - H

431.37 k J m o l^{- 1}

C = C

606.10 k J m o l^{- 1}

C - C

336.49 k J m o l^{- 1}

C - H

410.50 k J m o l^{- 1}

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