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6. Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry6. Haloalkanes and Haloarenes1 Mark
MCQ
Correct reactivity order of Alkyl halide towards dehydrohalogenation-
  • ✓
    $3^o > 2^o > 1^o$
  • B
    $1^o > 2^o > 3^o$
  • C
    $2^o > 1^o > 3^o$
  • D
    $1^o > 3^o > 2^o$
✓

Answer

Correct option: A.
$3^o > 2^o > 1^o$
a
According to Saytzeff rule, any alkyl halide that gives a more highly substituted (more stable) alkene undergoes dehydrohahyenation faster than the one which gives a less highly substituted (less stable) alkane. Thus, the case of dehydrohalogenation of different alkyl halides having the same halogen decreases in the order: $3^{\circ} (tertiary) > 2^{\circ} (secondary) > 1^{\circ} (Primary)$

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