NEET 2009 Chemistry question

Which of the following reactions is an example of nucleophilic susbtitution reaction?

(1)2 RX + 2 Na R - R + 2 NaX
(2)RX + H RH + HX
(3)RX + Mg RMgX
(4)RX + KOH ROH + KXCorrect

Answer: (4)

Solution

In the nucleophile replaces the halide ion (the leaving group) on the carbon, so this is a nucleophilic substitution () reaction. Hence option (4). Option

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Question ID VK-090288