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Home  >>  JEEMAIN and AIPMT  >>  Chemistry  >>  Hydrocarbons
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Which one of the following will react fastest with $H_2$ under catalytic hydrogenation condition?

$\begin{array}{1 1} a \\ b \\ c \\ d\end{array}$

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1 Answer

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Saytzeff Rule implies that base-induced eliminations (E2) will lead predominantly to the olefin in which the double bond is more highly substituted, i.e. that the product distribution will be controlled by thermodynamics.
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The use of sterically hindered bases raises the activation energy barrier for the pathway to the product predicted by Saytzeff's Rule. Thus, a sterically hindered base will preferentially react with the least hindered protons, and the product distribution will be controlled by kinetics.
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From amongest given olefins(a) and (b) are less stable (Saytzeff's rule).Moreover syn-isomer is more reactive than anti because of sterical hindrance.
Hence (a) is the correct option.
answered Mar 18, 2014 by sreemathi.v
edited Mar 25, 2014 by mosymeow_1
 
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