The Mayor is the head of the municipal corporation, but in most states and territories of India the role is largely ceremonial as executive powers are vested in the Municipal Commissioner.

Mayor or Mahapur
The elected head of the Municipal Corporation is known as the Mayor or Mahapur. The Mayor is the highest-ranking official in the local government and plays a crucial role in the administration and governance of the city. This position is typically elected by the members of the Municipal Corporation or by the general public through a direct election process.

Responsibilities of the Mayor
1. Executive Powers: The Mayor serves as the chief executive officer of the Municipal Corporation and is responsible for the overall administration of the city. They have the authority to make decisions, implement policies, and ensure the smooth functioning of various departments within the Corporation.

2. Representative Role: The Mayor represents the city at various forums and events. They act as a spokesperson for the Municipal Corporation and advocate for the needs and interests of the local community.

3. Policy Formulation: The Mayor, along with other elected representatives, participates in the formulation of policies and regulations for the development and welfare of the city. They work closely with the Corporation members to address the concerns of the citizens and make decisions that benefit the community as a whole.

4. Financial Management: The Mayor plays a key role in the financial management of the Municipal Corporation. They are involved in the budgeting process, allocation of funds, and monitoring the financial health of the city. They ensure that resources are utilized efficiently and effectively to meet the needs of the city.

5. Public Engagement: The Mayor interacts with the public, listens to their grievances, and resolves issues related to the city's infrastructure, services, and amenities. They act as a bridge between the government and the citizens, promoting transparency, accountability, and citizen participation in local governance.

Other Possible Options:
a) Mahajan: Mahajan is not the correct term for the elected head of the Municipal Corporation. It is a term used to refer to a community leader or a person holding a position in a local association or committee.

b) Corporator: A Corporator is an elected member of the Municipal Corporation who represents a specific ward or constituency. They work collectively with other Corporators to address local issues and participate in the decision-making process.

c) Commissioner: A Commissioner is a senior administrative officer appointed by the government to oversee the functioning of the Municipal Corporation. They are responsible for implementing policies, managing resources, and ensuring the proper execution of projects and programs.

Conclusion:
In conclusion, the elected head of the Municipal Corporation is known as the Mayor or Mahapur. The Mayor holds executive powers, represents the city, formulates policies, manages finances, and engages with the public. The other options mentioned in the question, such as Mahajan, Corporator, and Commissioner, have different roles and responsibilities within the local governance structure.