One mole of each of the following alkenes is catalytically hydrog… - Vidyadip

MCQ

One mole of each of the following alkenes is catalytically hydrogenated. The quantity of heat evolved will be the lowest in the case of

A
$1-$butene
B
Trans$-2-$butene
C
Cis$-2-$butene
✓
$1, 3-$butadiene

✓

Answer

Correct option: D.

$1, 3-$butadiene

d
The more branched the alkene is, the lower will be its heat of catalytic hydrogenation.

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$\begin{array}{*{20}{c}}
{A\xleftarrow{{HBr}}Ph - CH = C - C{H_3}\xrightarrow[{Peroxide}]{{HBr}}B,} \\
{\,\,|} \\
{\,\,\,\,\,\,\,\,C{H_3}}
\end{array}$

$A$ and $B$ is