Give the structure and IUPAC name of disaccharide, which gives the reactio given below: Given, (A) does not reduce Fehling's solution and does not mutarotate.

Give the structure and IUPAC name of disaccharide, which gives the rea

1.	Give the structure and IUPAC name of disaccharide, which gives the reactio given below: Given, (A) does not reduce Fehling's solution and does not mutarotate.
Answer» Solution :(i). It does not reduce Fehling'ssolution and does not mutarotate, which suggests that hemiacetalic `OH` group at `C-1` of glucose and hemiketalic `OH` group at `C-2` of fructose are not free and are involved in glycosidic linkage. ii. Hydeoysis by maltose suggests `alpha-`linkage and HYDROLYSIS by emulsin suggests `beta-`linkage. ii. Hydrolysis by maltase suggests `alpha-`linkage and hydrolysis by emulsin suggests `beta-`linkage. iii. PRODUCTS obtained after the methylation and hydrolysis of `(A)` suggest `(C-1) (OH) (alpha)` of glucose and `(C-2) (OH) (beta)` of fructose are involved in glycosidic linkage. iv. Glucose is in puranose FORM which suggests a six-membered ring. v. Fructose is in FURANOSE form and this suggests a five-membered ring. All the observations suggest that `(A)` is SUCROSE.