Number of electrophilic centres in the given compound is ____________.
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Correct Answer: 3
Solution and Explanation
Electrophilic (electron-poor) centres:
1. Carbonyl carbon (C=O): attacked in 1,2-addition.
2. beta-carbon of the C=C conjugated with C=O: attacked in 1,4-(conjugate) addition.
3. Nitrile carbon (C of \(\mathrm{C\equiv N}\)).
The aromatic ring carbons are not counted as electrophilic centres.
Number = 3.
Answer: 3
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