Give reasons for the following:(a) CCl4 is immiscible in water, whereas SiCl4 is easily hydrolysed.

Hi, I have a question and I hope anyone could answer it:

Give reasons for the following:
(a) CCl4 is immiscible in water, whereas SiCl4 is easily hydrolysed.
(b) Carbon has a strong tendency for catenation compared to silicon. 

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1 Answer

  1. (i) H2O is a polar molecule, whereas CCl4 is a covalent compound. It is hence insoluble in water. Alternately, CCl4 is insoluble in water because it lacks orbitals that can accommodate the electrons that water molecules’ oxygen atoms provide it. As a result, CCl4 and the water molecules do not interact, making CCl4 insoluble in water. SiCl4, on the other hand, has d-orbitals that can hold the single pair of electrons that the oxygen atom in water molecules donates. The outcome is that SiCl4 and water molecules interact strongly. SiCl4 is thus hydrolyzed by water to produce silicic acid.

    (b) The bond dissociation energy decreases rapidly as the atomic size increases. Since the atomic size of carbon is much smaller (77 pm) as compared to that of silicon (118 pm), therefore, carbon-carbon bond dissociation energy is much higher (348 kJ mol-1) than that of silicon-silicon bond (297 kJ mol-1). Hence, because C – C bonds are much stronger as compared to Si-Si bonds, carbon has a much higher tendency for catenation than silicon.