JEE MAIN - Chemistry (2018 - 16th April Morning Slot - No. 13)
Among the following, the incorrect statement is :
Maltose and lactose has 1, 4 - glycosidic linkage.
Sucrose and amylose has 1, 2 - glycosidic linkage
Cellulose and amylose has 1, 4 - glycosidic linkage.
Lactose contains $$\beta $$-D-galactose and $$\beta $$-D-glucose.
Explanation
(a) Both maltose and lactose have 1,4-glycosidic linkage.
(b) In sucrose, C1-$$\alpha $$ of glucose is connected to C2-$$\beta $$ of fructose. In amylose, C1 of one glucose unit is attached to C4 of other glucose through $$\alpha $$-glycosidic linkage.
(c) Cellulose has 1,4-$$\beta $$-D-glycosidic linkage, but amylose has 1,4-$$\alpha $$-D-glycosidic linkage.
(d) In lactose, C1-$$\beta $$ of galactose is linked to C4-$$\beta $$ of glucose.
(b) In sucrose, C1-$$\alpha $$ of glucose is connected to C2-$$\beta $$ of fructose. In amylose, C1 of one glucose unit is attached to C4 of other glucose through $$\alpha $$-glycosidic linkage.
(c) Cellulose has 1,4-$$\beta $$-D-glycosidic linkage, but amylose has 1,4-$$\alpha $$-D-glycosidic linkage.
(d) In lactose, C1-$$\beta $$ of galactose is linked to C4-$$\beta $$ of glucose.
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