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Multiple Bond Formation

why silicon c...

Question

why silicon cannot formpπ − pπ multiple bonds due to its large size?

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Solution

The size of metal increases from top to bottom due to the effect of extra shell being added from member to member in group 14. Silicon have vacant d-orbitals these permit the formation of coordinate bonds with other atoms or ions having lone pair of electrons. The atomic orbitals of Si is too large and diffuse to obtain effective overlap,but it can use d-orbitals in multiple bonding ,particularly between Si and N or O.

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Q. Assertion: Both rhombic and monoclinic sulphur exist as

S_{8}

but oxygen exists as

O_{2} .

Reason: Oxygen form

p π - p π

multiple bond due to small size and small bond length but

p π - p π

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Q. Choose the correct statement(s):
1. Carbon has unique ability to form pπ−pπ multiple bonds with itself .
2. Pb, Sn donot form pπ−pπ multiple bonds.
3. Pb, Sn form pπ−pπ multiple bonds.
4. Carbon can accomodate more than 4 electron.

Q. Silicon exists only in the diamond structure due to tendency to form

p π - p π

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Q. Nitrogen has unique ability to form

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multiple bonds with itself and with other elements due to:

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C - C

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