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KCN provides CN⁻ , which undergoes nucleophilic substitution with CH₃CH₂Br to form CH₃CH₂CN (propanenitrile).
Ref: NCERT Class 12 Chemistry > Chapter 6: Haloalkanes and Haloarenes > Topic: Nucleophilic Substitution Reactions - SN1 and SN2 Mechanisms
KCN substitutes Br in CH₃CH₂CH₂Br via SN₂ , forming CH₃CH₂CH₂CN (butanenitrile).
Ref: NCERT Class 12 Chemistry > Chapter 6: Haloalkanes and Haloarenes > Topic: Nature of C-X Bond and Methods of Preparation
In the SN₂ reaction, Br⁻ is displaced by CN⁻ and acts as the leaving group.
Ref: NCERT Class 12 Chemistry > Chapter 6: Haloalkanes and Haloarenes > Topic: Classification and Nomenclature and Isomerism of Haloalkanes
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