(I) Each carbon shows hybridization of sp3 in diamond. (II) The carbon atoms in graphite forms planar hexagonal layer. (III) Silicones are having chemical formula of (R2SiO)n. They are produced from non-alkyl groups which repel water. (IV) In group 14 elements, the tendency of catenation goes on decreasing as elements bond strength decreases. Therefore, the correct order is C>>Si>Ge≈Sn Hence, statements (I), (II) and (III) are correct.