A) \[{{3}^{o}}<{{2}^{o}}<{{1}^{o}}\]
B) \[{{3}^{o}}>{{2}^{o}}>{{1}^{o}}\]
C) \[{{3}^{o}}<{{2}^{o}}>{{1}^{o}}\]
D) \[{{3}^{o}}>{{2}^{o}}<{{1}^{o}}\]
Correct Answer: B
Solution :
According to Saytzeff rule, any alkyl halide that gives a more highly substituted(more stable) alkene undergoes dehydrohalogenation faster than the one which gives a less highly substituted (less stable) alkene. Thus, the ease of dehydrohalogenation of different alkyl halides having the same halogen decreases in the order tertiary \[({{3}^{o}})>\] secondary \[({{2}^{o}})>\] primary \[({{1}^{o}}).\]
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