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Haloalkanes react with KCN to form alkyl...

Haloalkanes react with KCN to form alkyl cyanides as main product while AgCN forms isocyanides as the chief product. Explain.

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Cyanide ion is an ambient nucleophile, KCN is predominantly an ionic compound and attack takes place mainly through carbon of cyanide as C - C bond is more stable than C - N bond. However AgCN is mainly covalent and nitrogen is free to donate electron pair forming isocyanide.
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Assertion: Haloalkanes react with KCN to form alkyl cyanides as main product while with AgCN form isocyanide as the main product. Reason: KCN and AgCN, both are ionic compounds.

In the following questions, a statement of assertion (A) is following by a statement of reason (R ) A : Haloalkanes react with KCN to give alkyl cyanide as the main product while with AgCN they form isocyanide as the main product. R: In KCN, k form ionic bond due to which one lone pair present on carbon, so carbon act as donor but in AgCN, Ag form covalent bond and carbon has no lone pair so N-atom act as donor.

Account for the following Chloromethane reacts with KCN to form ethanenitrile as the main product and wit AgCN to form methyl isocyanide as the chief product.

CuSO_(4) reacts with KCN to form

Give reasons for the following: (a) Potassium cyanide reacts with R -X to give alkyl cyanide. While silver cyanide forms an isocyanide as a major product. (b) Silver nitrite reacts R-X to give a mixture of nitroalkane and alkyl nitrite. (c) R-OH does not react NaBr but on adding H_(2)SO_(4) . if forms R-Br. (d) Alcohols do not undergo substitutionl in neutrol or alkaline solution.

NARAYNA-HALOALKANE AND HALOARENES-EXERCISE - 4
  1. Haloalkanes react with KCN to form alkyl cyanides as main product whil...

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  2. Alkyl halide reacts with an alcoholic solution of ammonia to give a mi...

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  3. Product – I overset("aq KOH")larrC2H5Br overset("alc. KOH")rarr Pro...

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  4. Y is :

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  5. (CH3)2CHCloverset(NaF)underset(H2O)rarr(Y) X+Yoverset(H^+)rarr(Z) ...

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  6. Chlorobenzene towards hydrolysis is ,

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  7. Following equation illustrates C(6)H(5)CI+2NaOHunderset(200atm)overs...

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  8. Alkyl halide on heating with alc. NH3 in a sealed tube results

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  9. Carbylamine is liberated when …….is heated with chloroform and alcohol...

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  10. End product of following sequence of reaction is

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  11. X, Y and Z, respectively are :

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  12. CH2=CHCH2=CH2overset(NBS)rarrA A is

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  13. underset("major")Bunderset(CH3CH2OH)overset(CH3CH2ONa)larrCH3-overset(...

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  15. When an alkylhalide is dissolved in ethanol the following reaction bei...

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  16. Major product of the following SN1 reaction is : H3C-underset(Br)un...

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  17. Ethylene reacts with bromine to from

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  18. The reactivities of methyl chloride, propyl chloride and chlorobenzene...

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  19. An alkyl halide of formula C6H (13)CI on treatment with potassium t-b...

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  20. . A and B

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  21. on treatment with aqueous KOH

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