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Why N(CH(3))(3) is more basic than N(...

Why `N(CH_(3))_(3)` is more basic than `N(SiMe_(3))_(3)` ?

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This is because the lone pair of electron of `N` (present in the2p orbital ) is transferred to the empty d-orbital of Si (`ppi-dpi` overlapping) and hence it is not available for protonation . As a result, `N(SiMe_(3))_(3)` is a weaker base than `N(CH_(3))_(3)` or `N(SiH_(3))_(3)` is a stronger base than `N(CH_(3))_(3)`.
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PRADEEP-SOME p-BLOCK ELEMENTS-CONCEPTUAL QUESTIONS (GROUP 14 ELEMENTS)
  1. Why is+2oxidiation state of lead more stable than +4 oxidation state?

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  2. Why carbon froms covalent compounds whereas lead forms ionic compounds...

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  3. Give one chemical reaction to show that : (i) Sn(II) is a reducing a...

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  4. PbO2 acts as a stronger oxidising agent than SnO2. Cmment .

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  5. PbO(2) can act as an oxidising agent.

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  6. Carbon monoxide is readily absorbed by ammoniacal cuprous chloride so...

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  7. CO is stable , but analogous SiO is not stable . Why ?

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  8. Why N(CH(3))(3) is pyramidal but N(SiH(3))(3) is planar ?

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  9. (SiH(3)) is a weaker base than (CH(3))(3)N. Explain.

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  10. Why N(CH(3))(3) is more basic than N(SiMe(3))(3) ?

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  11. Account for the following : (i) PbX(2) is more stable than PbX(4) (X ...

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  12. Why C Cl4 is resistant to hydrolysis , but SiCl4 is readily hudrolgyse...

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  13. The tendency towards catenation among group 14 elements down the group

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  14. why carbon show catenation but silicon does not ?

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  15. Give reason : Down the group tendency for catenation decreases among g...

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  16. Silanes are few in number whereas alkanes are large in number . Explai...

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  17. Why does not sillicon form an analogue of graphite?

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  18. Why does elemental silicon not form graphite like structure as carb...

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  19. No form fo elecmental silicon is comparabnle to graphite Give reason .

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  20. CO(2) is a gas while SiO(2) is a solid. Explain.

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