Q40 / 160 · AP EAMCET 2008 · Chemistry
Hydrolysis of sucrose with dilute aqueous sulphuric acid yields
- Correct answerA1: 1 D-(+)-glucose; D-(-)-fructose
- B1 : 2 D-(+)-glucose; D-(-)-fructose
- C1: 1 D-(-)-glucose; D-(+)-fructose
- D$1: 2$ D-(-)-glucose; D-(+)-fructose
Solution
On hydrolysis with dilute aqueous sulphuric acid, sucrose gives a equimolar mixture of D-(+) glucose and D-(-)-fructose.
$$
\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}+\mathrm{H}_2 \mathrm{O} \stackrel{\mathrm{H}_2 \mathrm{SO}_4}{\longrightarrow}
$$
sucrose
$$
\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6
$$
D-(+) glucose D-(-) fructose 1 : 1 arter hydrolysis
Sucrose is dextrorotatory but after hydrolysis gives dextrorotatory and laevorotatory fructose, laevorotatory fructose is more, so the mixture is laevorotatory.
Hence, the correct answer is option: 'A'.