Which one of the following compounds contains $\beta-C_{1}-C_{4}$ glycosidic linkage?

Which carbon atoms of fructose are bonded together through oxygen forming fructofuranose?

Which of the following structures represents thymine?

Given below are two statements: one is labelled as Assertion $A$ and other is labelled as Reason $R.$
Assertion $A :$ Sucrose is a disaccharide and a non-reducing sugar.
Reason $R :$ Sucrose involves glycosidic linkage between $C_{1}$ of $\beta$-glucose and $C_{2}$ of $\alpha$-fructose.
Choose the most appropriate answer from the options given below :

Which carbon atoms of $\alpha-D$-glucopyranose and $\beta-D$-fructofuranose respectively are linked together to form the glycosidic linkage in sucrose?

Identify the glycosidic linkage present in lactose.