According to Karl Marx, a communistic society would be composed entirely of bourgeoisie
be composed entirely of bourgeoisie

be made up of capitalists and the proletariat
be made up of capitalists and the proletariat

have a wide variety of social classes
have a wide variety of social classes

be classless

Ans: The longest wavelength = 450nm(Approx)

Explanation:

Since,

λ=hc/E --- (1)

where h=Plank's Constant=6.626x10^-34 Js

and c=Speed of Light = 3 x10^8 m/s

The energy to break a π bond =E= 4.42*10^-19 J/molecule

Substitute those values into equation (1):
λ=(6.626 x 10^-34)(3 x 10^8)/(4.42*10^-19)
λ=4.497*10^-7m 

or(in nm)

λ=450nm(approx)