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KCET2016ChemistryHaloalkanes and Haloarenes

Reactivity of order of halides for dehydrohalogenation is

Options

  1. A( R-F>R-C l>R-B r>R-I )
  2. B( R-I>R-B r>R-C l>R-F )
  3. C( R-I>R-C l>R-B r>R-F )
  4. D( R-F>R-l>R-B r>R-C l )

Correct answer

B. ( R-I>R-B r>R-C l>R-F )

Step-by-step solution

When heated with strong bases, alkyl halides typicallyundergo a ( ) - elimination reactions to generate alkenes. Theorder of reactivity towards ( ) - elimination is ( |>B r>C|>F ). Therefore, the order of reactivity of alky halides is ( R-1>R-B r>R- ) ( Cl > R - F ).

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