Identify the intermediate formed in the given reaction of $D$-glucose with methanol in the presence of an acid catalyst $(H^+)$.

The correct corresponding order of names of four aldoses with configurations given below,respectively,is:
$(1)$ $CHO-CH(OH)-CH(OH)-CH_2OH$ (both $-OH$ on right)
$(2)$ $CHO-CH(OH)-CH(OH)-CH_2OH$ ($-OH$ on left at $C-2$,right at $C-3$)
$(3)$ $CHO-CH(OH)-CH(OH)-CH_2OH$ (both $-OH$ on left)
$(4)$ $CHO-CH(OH)-CH(OH)-CH_2OH$ ($-OH$ on right at $C-2$,left at $C-3$)

Complete hydrolysis of cellulose gives

Sucrose molecule is made up of

Which of the following statements is incorrect about $\alpha-D$-glucopyranose and $\beta-D$-glucopyranose?

What is the product formed when sucrose is treated with concentrated sulfuric acid $(H_2SO_4)$?