In which of the following parts of the mitochondria is the succinic dehydrogenase enzyme located?

Identify the location of the chemical cycle shown below.

Match the compounds given in column-$I$ with the number of carbon atoms present in them which are listed under column-$II$. Choose the answer which shows the correct combination of alphabets of the two columns.

Column-$I$	Column-$II$
$A$. Oxaloacetate	$p$. $6-C$ compound
$B$. Phosphoglyceraldehyde	$q$. $5-C$ compound
$C$. Isocitrate	$r$. $4-C$ compound
$D$. $\alpha$-Ketoglutarate	$s$. $3-C$ compound
	$t$. $2-C$ compound

$(i)$ 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 the Krebs cycle,what happens to pyruvic acid?

The pyruvic acid formed in Glycolysis is oxidized to $CO_2$ and $H_2O$ in a cycle called