Question

$A \xrightarrow {HOH/H^+}$ glucose + fructose
$B \xrightarrow {HOH/H^+}$ glucose + glucose
$C \xrightarrow {HOH/H^+}$ glucose + galactose
The disaccharides $A, B$ and $C$ respectively are

• A. lactose, sucrose and maltose
• B. sucrose, maltose and lactose
• C. sucrose, lactose and maltose
• D. maltose, sucrose and lactose

Answer 1

Answer: (B)

$(+)- \underset{(C_{12}H_{22}O_{11})}{\text{Sucrose}} \xrightarrow {HOH/H^+}D(+) - \underset{(C_6H_{12}O_6)}{\text{glucose}} + D(-) - \underset{(C_6H_{12}O_6)}{\text{fructose}}$ $\underset{(C_{12}H_{22}O_{11})}{\text{Maltose}} \xrightarrow {HOH/H^+}$ Glucose + Glucose
$\underset{(C_{12}H_{22}O_{11})}{\text{Lactose}}\xrightarrow {HOH/H^+}D(+)-$ glucose $+D(+)-$ galactose