How would you distinguish monocots from dicots ?

Suppose a plant has tuberous roots and rhizomes both as underground structures. How can you distinguish a root from rhizome ?

How do you distinguish formic acid from acetic acid ?

Distinguish glucose from fructose.

How would you distinguish between baking powder and washing soda by heating ?

How would you distinguish experimentally between an alcohol and a carhoxylic acid?

How would you distinguish between (i) methyl alcohol and ethyl alcohol (ii) benzyl alcohol and phenol (iii) ethyl alcohol and benzyl alcohol