Provide the bond lengths for hydrogen, ethane, ethene, and ethyne.

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MoleculeBond Lengths
Hydrogen $(H_2)$$H-H: 74 \, pm$
Ethane $(C_2H_6)$$C-C: 154 \, pm, C-H: 109 \, pm$
Ethene $(C_2H_4)$$C=C: 134 \, pm, C-H: 108 \, pm$
Ethyne $(C_2H_2)$$C\equiv C: 120 \, pm, C-H: 107 \, pm$

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