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What is the correct order of reactivity of haloalkanes towards β-elimination reactions?

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What is the correct order of reactivity of haloalkanes towards β-elimination reactions?

(a) 1°>2°>3°

(b) 3°>2°>1°

(c) 1°>3°>2°

(d) 3°>1°>2°

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Asked question is from Haloalkanes & Haloarenes topic in section Haloalkanes and Haloarenes of Chemistry – Class 12

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The correct choice is (b) 3°>2°>1°

Easiest explanation: The haloalkanes which will form more stable (highly substituted) alkenes are the ones that will react the fastest. Since tertiary alkyl halides will form the most stable alkenes, they are the most reactive.

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