Respuesta :

Answer:

The molecule having shortest C-C bond is acetylene (CHCH)

Explanation:

Note : CH3CH2OH has longest bond length

The bond length order from longer to shorter is :

CH3CH2OH > CH3CH3 > CH2CH2 > CHCH

(More bond order shorter the bond length)

The C-C bond length in Ethanol[tex]CH_{3}CH_{2}OH[/tex] is more than ethane

  • Here there is single bond between the carbons
  • [tex]sp^{3}-sp^{3}[/tex] overlap
  • It has lowest Bond-dissociation energy (88 Kcal/mole)

The C-C bond length in Ethane [tex]CH_{3}CH_{3}[/tex] is 1.54 Angstrom

  • Here there is single bond between the carbons
  • [tex]sp^{3}-sp^{3}[/tex] overlap
  • It has low Bond-dissociation energy (90 kcal/mole : means bonds are long and broken easily but 2 kcal/mole stronger than ethane)
  • Bonds are shorter than ethanol.

The C-C bond length in Ethene [tex]CH_{2}CH_{2}[/tex] is  1.34 Angstrom

  • Here there is double-bond between the carbons
  • The C-C bond distance is shorter than ethane
  • [tex]sp^{2}-sp^{2}[/tex] overlap
  • It has high Bond-dissociation energy than ethane (bonds are stronger than ethane)

The C-C bond length in acetylene

[tex]CH_{2}CH_{2}[/tex] is 1.20 Angstrom

  • Here there is triple-bond between the carbons
  • [tex]sp-sp[/tex] overlap
  • The C-C bond distance is shortest of all
  • It has maximum Bond-dissociation energy.Strongest and shortest bond

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