# Will (3R,4S,5R)-1,3,4,5,6-pentahydroxyhexan-2-one tautomerise in nitric acid?

The following question was sent to me .The question is " Which of the following is A ?"

Background

If both ends of an aldose chain are oxidized to carboxylic acids the product is called an aldaric acid.

My thoughts

My answer hinges on tautomerisation of ketone is acidic medium. Would this compound (3R,4S,5R)-1,3,4,5,6-pentahydroxyhexan-2-one tautomerise in nitric acid ?

Any help in this regard is very much appreciated. Thankyou.

reference :