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Q.
The species which acts as both nucleophile and electrophile is
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Solution:
Those compounds in which the carbon atom is attached with strongly electronegative element (like N or O) by $ \pi $ bond, generally act as both electrophile and nucleophile. e.g., $ C{{H}_{3}}-\overset{\pi \,bond}{\mathop{C}}\,\equiv N\leftarrow \text{strongly}\,\text{electronegative} $