[poshakpathak]

Ethene is reacted with steam in the presence of concentrated H₃PO₄. The product of this reaction is added to acidified potassium dichromate(VI) and heated under reflux for one hour. The final
organic product is collected and labelled X.

But-2-ene is treated with hot, concentrated, acidified potassium manganate(VII). The final
organic product is collected and labelled Y.
Which statement is correct?

A One molecule of X has more carbon atoms than one molecule of Y.
B One molecule of Y has more carbon atoms than one molecule of X.
C X and Y have different functional groups.
D X is the same compound as Y.

I thought the answer would be C as X is carboxylic acid and Y is diol. Answer says D. 
Also, why is option B incorrect, dont they have more carbon atoms?

[AWK]

The acidified potassium manganate(VII) solution usually oxidizes the alkene by breaking the carbon-carbon double bond