১অনু বেনজিনে _____ কার্বন পরমাণু আছে।
To solve this problem, let's analyze it step-by-step:

Step-1: A single molecule of benzene contains 6 carbon atoms.

Step-2: The chemical formula for benzene is C6H6

Step-3: It consists of a ring structure with six carbon atoms and six hydrogen atoms.

Step-4:  Therefore, one molecule of benzene contains 6 carbon atoms.

#Answer: 6