What is glycolysis?

Glucose is a/an:

How can you say that glucose is a cyclic compound?

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

$(i) \ CHO-(CHOH)_3-CH_2OH \xrightarrow{4HIO_4} \text{Product}$
$(ii) \ CH_2OH-(CHOH)_4-CH_2OH \xrightarrow{5HIO_4} \text{Product}$
\text{The ratio of moles of formic acid obtained in reaction } $(i)$ \text{ and reaction } (ii) \text{ is:}

Which of the following is the correct structure of $L$-fructose?