Isomerism

$\mathbf{P}$ shows geometrical isomerism and absorbs light of higher wavelength than that of $\mathbf{Q}$.

Both $\mathbf{P}$ and $\mathbf{Q}$ show geometrical isomerism and $\mathbf{P}$ absorbs light of higher wavelength than that of $\mathbf{Q}$.

Q shows geometrical isomerism and absorbs light of higher wavelength than that of $\mathbf{P}$.

$\mathbf{P}$ shows geometrical isomerism and absorbs light of lower wavelength than that of $\mathbf{Q}$.