Give reasons for the following:

(i) CCl_{4} is immiscible in water, whereas SiCl_{4} is easily hydrolyzed.

(ii) Carbon has a strong tendency for catenation compared to silicon.

Answers (1)

(i) CCl_{4} is a compound that is unable to form H bonds with water as it is a polar compound. It is insoluble, and carbon does not have d orbital and cannot take in any extra electrons from the oxygen molecule. If the central atom cannot take in lone pair of electrons, then it cannot be hydrolyzed. SiCl_{4} can undergo hydrolysis as it can accept a lone pair of electrons.

 

(ii) As the atomic size increases, the bond dissociation energy decreases, and since carbon has a size much smaller than silicon, then the dissociation energy of carbon is higher. Thus the carbon bonds are stronger and higher tendency for catenation than silicon.

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