Which one of the following structures represents amylose?

The structures of cyclic $D$-glucoside are given. Determine the moles of $HIO_4$ consumed by $X$ and $Y$ respectively.

Which of the following elements of matter would best convey that there is life on Earth?

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 $C-3$)

The term anomers of glucose refers to

Glucose and mannose are