Answer :
The descending order of carbon-carbon bond length in C2H6, C2H4, and C2H2 is
C2H6, C2H4, C2H2
Hydrocarbons are compounds that consist of only hydrogen and carbon.
On the basis of the presence or absence of double bonds/triple bonds, they are of three types- alkanes, alkenes, and alkynes.
Alkanes do not contain any double bonds.
Alkenes contain one or more double bond(s) between the carbon atoms.
Alkenes contain one or more triple bond(s) between carbon atoms.
The comparison between alkanes, alkenes, and alkynes is given in the adjoining image.
We can see that the bond length in alkanes like C2H6 is 1.53 A which is greater than alkenes(C2H4) , 1.33 A which is still greater than alkynes(C2H2) with a value of 1.18 A.
Thus, The descending order of carbon-carbon bond length in C2H6, C2H4, and C2H2 is
C2H6, C2H4, C2H2
To know more about "hydrocarbons", refer to the link given below:
https://brainly.com/question/16858042?referrer=searchResults
#SPJ4