Based on the CBSE syllabus, this book is meant for students of class 11 of Bihar, Jharkhand and all other state boards following the CBSE syllabus. Questions are divided into models. Solved problems covering all aspects of the topic are followed by a comprehensive exercise section. A large number of questions, including those asked in competitive examinations like the IIT, etc., have been given at the end of each section, and at the end of the book. This book will also be helpful for students preparing for various competitive examinations.