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$1.$ 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 $2.$
$(a)$ Diborane is prepared by the oxidation of $\mathrm{NaBH}_{4}$ with $\mathrm{I}_{2}$.
$(b)$ Each boron atom is in sp $^{2}$ hybridized state.
$(c)$ Diborane has one bridged $3$ centre$-2-$electron bond.
$(d)$ Diborane is a planar molecule.
The option with correct statement(s) is :