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  4. Which one of the following is used to obtain the maximum percentage of terminal alkene by dehydrohalogenation of CH 3 CH 2 C ( CH 3)2 Br ?

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Q. Which one of the following is used to obtain the maximum percentage of terminal alkene by dehydrohalogenation of $CH _{3} CH _{2} C \left( CH _{3}\right)_{2} Br ?$

TS EAMCET 2019

Solution:

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So, in this reaction potassium tert-butoxide in tert-butyl alcohol $\left[\left( CH _{3}\right)_{3} CO ^{-} K ^{+} in \left( CH _{3}\right)_{3} COH \right]$ is

used to obtain the maximum percentage of terminal alkene by dehydrohalogenation of $CH _{3} CH _{2} C \left( CH _{3}\right)_{2} Br$.

Note When a more hindered base is used, more of the thermodynamically less favoured terminal alkene is generated.

If we will use other base then the reaction takes place as follows:

image