Use ionic potential $\varphi =$ charge/radius with radii $\mathrm{Li}{}^{+}=76$, $\mathrm{Na}{}^{+}=102$, $\mathrm{K}{}^{+}=138$, $\mathrm{Be}{}^{2+}=45$, $\mathrm{Mg}{}^{2+}=72$ and $\mathrm{Al}{}^{3+}=54\mathrm{pm}$. Which statements are correct?

1. A$\varphi (\mathrm{Al}{}^{3+})>\varphi (\mathrm{Be}{}^{2+})$
2. B$\varphi (\mathrm{Li}{}^{+})$ lies between $\varphi (\mathrm{Na}{}^{+})$ and $\varphi (\mathrm{Mg}{}^{2+})$
3. C$\varphi (\mathrm{K}{}^{+})>\varphi (\mathrm{Na}{}^{+})$
4. D$\varphi (\mathrm{Mg}{}^{2+})$ is more than twice $\varphi (\mathrm{Li}{}^{+})$