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KCET2011ChemistryHaloalkanes and Haloarenes

Following is the substitution reaction in which - CN replaces - Cl . R- Cl + (alcoholic) KCN - CN + KCl To obtain propanenitrile, R- Cl should be

Options

  1. Achloroethane
  2. B1 -chloropropane
  3. Cchloromethane
  4. D2-chloropropane

Correct answer

A. chloroethane

Step-by-step solution

Hydrolysis of t -butyl bromide with aqueous NaOH is an example of S _ N 1 reaction, therefore rate of the reaction depends only on concentration of haloalkane. Rate [haloalkane] C ₂ H ₅- Cl + (alc.) KCN C ₂ H ₅- CN + KCl Hence, to obtain propanenitrile, R- Cl should be chloroethane.

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