STD 11 - 4. Chemical bonding and molecular structure — JEE STD 11 Science — Question

$\begin{array}{*{20}{c}} {{H_3}C - C{H_2} - CH - Et} \\ {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \end{array}$ about $C_2-C_3$ is (figure) 

$Image$

$1.$ The succeeding operations that enable this transformation of states are

$(A)$ Heating, cooling, heating, cooling

$(B)$ Cooling, heating, cooling, heating

$(C)$ Heating, cooling, cooling, heating

$(D)$ Cooling, heating, heating, cooling

$2.$ The pair of isochoric processes among the transormation of states is

$(A)$ $K$ to $L$ and $L$ to $M$

$(B)$ $L$ to $M$ and $N$ to $K$

$(C)$ $L$ to $M$ and $M$ to $N$

$(D)$ $M$ to $N$ and $N$ to $K$

Give the answer question $1$ and $2.$