Glucose reacts with bromine water to products `:`

When glucose reacts with bromine water, the major product is

Glucose reacts with bromine water to give gluconic acid. What information do you get from this reaction about the structure of glucose?

When glucose is reacted with bromine water the major product is 'x', in that 'x' no. of carboxylic groups ______

When 3-ethylpent-2-ene reacted with bromine water the major product as (IUPAC name):