Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :
- Both Statement I and Statement II are false
- Both Statement I and Statement II are true
- Statement I is true but Statement II is false
- Statement I is false but Statement II is true
Answer
(3) Statement I is true but Statement II is false
Solution
As per NCERT, sucrose is dextrorotatory ([ ]D = +66.5 ).
C12H22O11 + H2O H+ C6H12O6 + C6H12O6
(sucrose → D-(+)-glucose + D-(−)-fructose)
Glucose is dextrorotatory (+52.5 ) and fructose is laevorotatory (-92.4 ).
The laevorotation of fructose is more than the dextrorotation of glucose, the mixture is laevorotatory (invert sugar).
Statement I is true.
Statement II interchanges the two: glucose is dextrorotatory, not laevorotatory Statement II is false.
Answer: (3)