Statement-I: – Dipole moment of trans 2-butene is zeroStatement-II: – Dipole moment of all trans compounds is zero

Consider trans 2 -butene + I power of -CH3 groups  is same, they nullify each others effect, μ=0 Consider trans 2 – pentene+I Power of –CH3 gp & -C2H5 gp is not equal.∴μ≠0