What product will be formed when glucose reacts with excess phenyl hydrazine?

Glucosazone 

The correct answer is option 2. Glucosazone.

When glucose reacts with excess phenyl hydrazine, the product formed is glucosazone.The reaction of glucose with phenyl hydrazine occurs in multiple steps:

Formation of Phenylhydrazone:

Initially, one molecule of phenyl hydrazine reacts with the aldehyde group of glucose to form a phenylhydrazone.

Formation of Glucosazone:

When excess phenyl hydrazine is present, two more molecules of phenyl hydrazine react with the hydroxyl groups on the carbon atoms adjacent to the aldehyde group, resulting in the formation of a crystalline compound known as glucosazone.

The correct answer is Glucosazone