NCERT Class XII Chemistry
Chapter - Haloalkanes and Haloarenes
Questions with Solutions
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Question : 15
Total: 31
Write the mechanism of the following reactionn B u B r + K C N
n B u C N
Solution:
The given reaction is a nucleophilic substitution reaction of 1st order i.e., S N 1
Step 1 : Generation of nucleophileK C N
K + +
≡ N
Step 2 : Nucleophilic attack and formationof transition state :C H 3 C H 2 C H 2 C H 2 B r + K C N
C H 3 C H 2 C H 2 C H 2 C N + K B r
Step 1 : Generation of nucleophile
Step 2 : Nucleophilic attack and formationof transition state :
Step 3 : Generation of product:
Thus, we have
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