A popular hill station in Tamil Nadu famous for its scenic beauty and pleasant climate is:

The correct answer is: d) Kodaikanal.

Kodaikanal is a popular hill station in Tamil Nadu famous for its scenic beauty and pleasant climate. It is located in the Western Ghats mountains, at an altitude of 2,200 meters (7,200 feet). The town is surrounded by hills and forests, and has a number of lakes and waterfalls. Kodaikanal is a popular tourist destination, and is known for its beautiful scenery, pleasant climate, and a number of attractions, including:

• The Kodaikanal Lake: A large artificial lake, which is a popular spot for boating and swimming.
• The Bear Shola Falls: A beautiful waterfall, which is a popular spot for hiking and picnicking.
• The Pillar Rocks: A group of rock formations, which offer stunning views of the surrounding area.
• The Botanical Garden: A large garden with a variety of plants and flowers.
• The Government Museum: A museum with a collection of artifacts from the region.
• The Bryant Park: A large park with a variety of trees and flowers.

Kodaikanal is a great place to visit for a relaxing vacation. The town is well-developed, and has a number of hotels, restaurants, and shops. The climate is pleasant year-round, and there are a number of things to see and do.