Which one of the following types of reaction occurs during the conversion of isocitrate $\rightarrow$ oxalosuccinate?

$(i)$ Label $A, B, C$ and $D$.
$(ii)$ How many $CO_2$ molecules are evolved between $A$ and Malic acid?
Choose the correct option from the following regarding the answers to the above questions $:-$

In Krebs' cycle,$GTP$ is formed in

Hydrogen of malate is accepted by

Oxidative decarboxylation occurs during the formation of

Match the columns based on the number of carbon atoms in the compounds involved in the Krebs cycle:

Column-$I$	Column-$II$
$(a)$ $4$ $C$ compound	$(1)$ Acetyl $CoA$
$(b)$ $2$ $C$ compound	$(2)$ Pyruvate
$(c)$ $5$ $C$ compound	$(3)$ Citric acid
$(d)$ $3$ $C$ compound	$(4)$ $\alpha$-Ketoglutaric acid
	$(5)$ Malic acid