Carbohydrates can be tested by using which of the following?

The correct option is A

Iodine

Correct option: A.

Explanation for correct option:

1. The presence of carbohydrates(like starch) in the solution can be tested by using an iodine solution.

Explanation for incorrect options:

Option B:

1. Caustic soda is used to test the presence of proteins in a solution.

Option C:

1. Copper sulphate is also used to test the presence of proteins in a solution.

Option D:

1. Fehling's solution is used to test whether a carbonyl-containing compound is an aldehyde or a ketone.