I don't know sorry I really need point
Answer:
The dimerization of butadiene to 4-vinylcyclohexene folows second order kinetics and its rate law will be given by :
![R=k[C_4H_6]^2](https://tex.z-dn.net/?f=R%3Dk%5BC_4H_6%5D%5E2)
Explanation:

The rate of the reaction ;
![R=k[C_4H_6]^x](https://tex.z-dn.net/?f=R%3Dk%5BC_4H_6%5D%5Ex)
As given in the question , that graph of time verses
was linear but plots of
or
was curved.
Generally:
Graph of time verses
for zero order reaction is linear with negative slope.
Graph of time verses
for secon order reaction is linear with negative slope.
Graph of time verses
for secon order reaction is linear with positive slope.
So, the dimerization of butadiene to 4-vinylcyclohexene folows second order kinetics and its rate law will be given by :
![R=k[C_4H_6]^2](https://tex.z-dn.net/?f=R%3Dk%5BC_4H_6%5D%5E2)
The group number tells us about the size weight and molecule elements involved. Also tells us about what types it can form and combine with as well as its reactions also