Arrange the following compounds in order of dehydrohalogenation 
reaction:
Text Solution
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In 
mechanism, the rate determining step is formation of carbocation. So, stability of carbocation formed decides the rate.
In option c, the cation formed is resonance stabilised.
In option 
, the cation formed is a 
carbocation.
In option 
and 
, the carbocations formed are 
but there is a chance of rearrangement in option 
and after the rearrangement, the carbocation formed in option 
will be allylic. So, the order of reaction is as follows:
.
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