Identify the final product of the following reaction sequence.

Step-by-step solution

The given starting material is an aldohexose. By observing the Fischer projection, the hydroxyl (-OH) group positions from C2 to C5 are left, left, right, right. This corresponds to D-mannose. The reaction sequence is as follows: Step (i): Oxidation with HNO ₃ Nitric acid is a strong oxidizing agent that oxidizes both the aldehyde group (-CHO) at C1 and the primary alcohol group (-CH₂ OH) at C6 of D-mannose to carboxylic acid groups (-COOH). This forms a 6-carbon dicarboxylic acid known as D-mannaric acid. Step (ii