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Why alkyl halides are considered to be very reactive compounds towards nucleophile?

Why alkyl halides are considered to be very reactive compounds towards nucleophile? Correct Answer they have an electrophilic carbon & a good leaving group

Alkyl halides are considered to be very reactive compounds towards nucleophile because they have an electrophilic carbon & a good leaving group as we go down the periodic table, halides that are larger in size will also be able to distribute their charge over a larger volume, making them less reactive (less basic). This is why fluoride is a much poorer leaving group than any of the other halides. So, alkyl halides are good for nucleophilic substitution reactions.

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