Which of the following enzymes is not useful in the digestion of proteins?

$C_{12}H_{22}O_{11} + H_2O \stackrel{\text{Enzyme A}}{\longrightarrow} C_6H_{12}O_6 + C_6H_{12}O_6$
$\text{Sucrose} \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \text{Glucose} \quad \quad \quad \quad \text{Fructose}$
$C_6H_{12}O_6 \stackrel{\text{Enzyme B}}{\longrightarrow} 2C_2H_5OH + 2CO_2$
$\text{Glucose}$
In the above reactions,the enzyme $A$ and enzyme $B$ respectively are :-

Enzymes are

Match the following enzymes in List-$I$ with their corresponding reactions in List-$II$.

$A$. Invertase	$I$. Maltose $\rightarrow$ Glucose
$B$. Pepsin	$II$. Sucrose $\rightarrow$ Glucose + Fructose
$C$. Diastase	$III$. Proteins $\rightarrow$ Peptides
	$IV$. Starch $\rightarrow$ Maltose

Which enzyme converts glucose and fructose both into ethanol?

Which enzyme converts starch into maltose?