The M.M. Punchhi Commission on Centre-State Relations made a recommendation regarding the disposal of a bill reserved for the consideration of the Union Executive. The correct answer is option 2, which states six months. This means that according to the recommendation made by the Punchhi Commission, the Union Executive should dispose of a bill within a period of six months.

It is important to note that the Union Executive refers to the executive branch of the central government, which is responsible for the implementation and administration of laws and policies at the national level. When a bill is reserved for the consideration of the Union Executive, it means that it has been sent to the central government for their review and decision-making process.

The Punchhi Commission on Centre-State Relations was a constitutional review commission that examined various aspects of the relationship between the central and state governments in India. It made several recommendations in its report, including those related to the disposal of bills by the Union Executive. The recommended time frame of six months suggests that the Commission believed that the central government should act promptly in reviewing and deciding upon bills reserved for their consideration.