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  4. The rate of the reaction <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/f4b254d4dc09b2967edc71b1972a20af-.png /> is influenced by the hyperconjugation effect of group R. If R sequentially is <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/f54c82255ad9a2aa8ab523fdbad066b3-.png /> the increasing order of speed of the above reaction is

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Q. The rate of the reaction
image
is influenced by the hyperconjugation effect of group $R$. If $R$ sequentially is
image the increasing order of speed of the above reaction is

Organic Chemistry – Some Basic Principles and Techniques

Solution:

More the number of $H$-atoms on the $\alpha$-carbon of the group $R$, more are the hyperconjugating structures, weaker is the $C - Br$ bond and hence, ethyl has two, iso-propyl has one and tert-butyl group has no $\alpha$-hydrogen therefore, hyperconjugation effect decreases and hence the rate decreases in the same order.