JEE Main Chemistry question

ChemistryHaloalkanes and HaloarenesJEE Main

How many of the following alkyl halides will readily undergo the reaction mechanism? (structures labelled (I)–(VII), comprising benzylic, allylic, simple primary/secondary, and tertiary halides)

Answer: 5

Solution

Substrates that ionise to a well-stabilised carbocation react readily by : benzylic halides (cation stabilised by the aromatic ring), allylic halides (cation stabilised by resonance with the adjacent double bond), and tertiary alkyl halides (cation stabilised by hyperconjugation/induction from three

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Question ID VK-148359