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Why does R(3)P=O exist but R(3)B=O does ...

Why does `R_(3)P=O` exist but `R_(3)B=O` does not (R = alkyl group) ?

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`R_(3)P=O` exist but `R_(3)N=O` does not.
Explanation :
`to` Nitrogen does not form `d pi-P pi` multiple bond with oxygen because of lack of d - orbitals in Nitrogen atom. But in case of `R_(3)N=O` the value of nitrogen should be 5. So these compounds do not exist where as in case of 'P' atom d-orbitals are available. So P-atom can able to form `d pi-P pi` multiple bonds hence `R_(3)P=O` exist.
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-P-BLOCK ELEMENTS -GROUP 15 ELEMENTS (VERY SHORT ANSWER QUESTIONS)
  1. Which chemical compound is formed in the brown ring test of nitrate io...

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  2. Give the resonating structures of NO(2) and N(2)O(5).

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  3. Why does R(3)P=O exist but R(3)B=O does not (R = alkyl group) ?

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  4. How is nitric oxide (NO) prepared ?

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  5. Give one example each of normal oxide and mixed oxide of nitrogen.

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  6. NO is paramagnetic in gaseous state but diamagnetic in liquid and soli...

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  7. Give an example of acidic oxide of phosphorus

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  8. Give an example of neutral oxide of nitrogen.

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  9. Explain the following reaction of alkali with red phosphrous.

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  10. Explain the following reaction between "PCl"(3) and H(3)PO(3).

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  11. How does "PCl"(3) react with "CH"(3)"COOH"

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  12. How does "PCl"(3) react with "CH"(3)"COOH"

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  13. How does "PCl"(3) react with water.

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  14. PCl(3) can act as an oxidizing as well as a reducing agent - Justify.

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  15. Which of the following are not known ? "PCl"(3),"AsCl"(3),"SbCl"(3),...

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  16. Which of the following is more covalent - "SbCl"(5)" or ""SbCl"(3) ?

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  17. Write the oxidation states of phosphorus in solid "PCl"(5).

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  18. Illustrate how copper metal can give different products on reaction wi...

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  19. Which oxide of nitrogen has oxidation number of N same as that in nitr...

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  20. Write the chemical reactions that occur in the manufacture of nitric a...

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