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In the carbon family , the elements othe...

In the carbon family , the elements other than carbon do not form ` p pi-p pi` nonds because the atomic orbitals are :

A

Large and diffuse to undergo effective lateral overlape.

B

Small and diffuse to underto effective lateral overlap.

C

Large and far too less diffuse to overlape linearly.

D

Small to overlap both laterally & linearly.

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The correct Answer is:
B
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In the carbon family , the elements other than carbon do not form pn-p pi nonds because the atomic orbitals are :

Assertion : Carbon has unique ability to form p pi-p pi multiple bonds with itself and with other atomic of small size and high electronegativety. Reason : Heaviur elements of group 14th do not form p pi -p pi bonds because their atomic orbital are too large and diffuse to have effective sideways overapping.

A : Heavier elements of 14th group do not form p pi - p pi bonds . R : Atomic orbital of heavier elements are too large and do not have effective overlapping .

A covalent bond will be formed by the overlapping of atomic orbitals having single electron of opposite spin, according to the overlapping of atomic orbitals the covalent bond may be of two types : (i) Sigma bond (sigma) " " (ii) Pi bond (pi) Sigma bond is stronger bond than the Pi-bond. If atomic orbitals overlap about the nuclear axis then sigma bond is formed but when atomic orbitals overlap sideway then Pi-bond is formed. The strength of bonds formed by 2s-2s,2p-2p and 2p-2s overlap has the order :

A2Z-P BLOCK ELEMENTS ( Group 13 -14)-General Characterstics, Pysical And Chemical Properties (Group 14)
  1. On heating graphite with conc. HNO(3) repetedly, a yellow mass is obta...

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  2. Which of the following compound is not hydrolysed?

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  3. SiH(4)+O(2) mixture on bubbling through water and bubbles comming in c...

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  4. Which is not correct?

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  5. Glass is soluble in

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  6. Bucky ball Buckministerfulleren is

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  7. Difference between diamond and graphite is due to:

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  8. When CO is heated with NaOH under pressure, we get

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  9. Calcium carbied react with water to produce

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  10. Tin dissolve in dilute HNO(3) forming

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  11. Monoxide of which of group 14 element is basic in nature?

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  12. Of the following compounds, which one is not observed?

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  13. Carbon dioxide is a gas but silica is a solid because:

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  14. C Cl(4) does not show hydrolysis but SiCl(4) is readily hydrolysed bec...

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  15. Pyrene(a fire extinguisher) is:

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  16. Addition of excess of sodium hydroxide solution to stannous chloride s...

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  17. In the carbon family , the elements other than carbon do not form p p...

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  18. Which one of the following chlorides is both a covalent liquied and ra...

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  19. PbCl(4) exists but PbBr(4) and PbI(4) do not because of

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  20. When chlorine is passsed through molten tin, the product obtained is

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