JEE Main202228 Jul 2022Evening ShiftChemistryBiomoleculesActual
The formulas of A and B for the following reaction sequence are
Options
- AA = C 7 H 14 O 8 , B = C 6 H 14
- BA = C 7 H 13 O 7 , B = C 7 H 14 O
- CA = C 7 H 12 O 8 , B = C 6 H 14
- DA = C 7 H 14 O 8 , B = C 6 H 14 O 6
Correct answer
A. A = C 7 H 14 O 8 , B = C 6 H 14
Step-by-step solution
Fructose is a polyhydroxy ketone, It reacts with HCN to form a cyanohydrin which on hydrolysis forms a alpha hydroxy carboxylic group. Fructose on reaction NaBH 4 forms D-sorbitol and D-mannitol( Mannitol and sorbitol are isomers, the only difference being the orientation of the hydroxyl group on carbon 2), which on reduction with HI in presence of red phosphorous form n-hexane.