Which of the following would have the shortest c-c bond length ch3ch3 chch - ch2ch2 all have the same bond length ch3ch2oh

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 Ethanolis more than ethane

Here there is single bond between the carbons overlapIt has lowest Bond-dissociation energy (88 Kcal/mole)

The C-C bond length in Ethane is 1.54 Angstrom

Here there is single bond between the carbons overlapIt 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 is  1.34 Angstrom

Here there is double-bond between the carbonsThe C-C bond distance is shorter than ethane overlapIt has high Bond-dissociation energy than ethane (bonds are stronger than ethane)

The C-C bond length in acetylene

is 1.20 Angstrom

Here there is triple-bond between the carbons overlapThe C-C bond distance is shortest of all It has maximum Bond-dissociation energy.Strongest and shortest bond

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