This is a Chemistry textbook for BSc 3rd semester Panjab University Chandigarh although Dr. J M Sehgal has written the content in accordance with the Punjabi and Patiala Universities also. Presented in the most suitable way by Modern Publishers, a reliable and well-liked publication house.

• the text has been prepared strictly in accordance with the new syllabus prescribed by the university
• the role of electronic and steric factors in determining the behavior of molecular species has been treated in a lucid and easy to understand the manner
• specific examples are given so that students can grasp the idea easily 
• the difficulties generally experienced by the students in remembering and reproducing the mechanism have been kept in view
• questions given at the end of each chapter have a large variety and include practically every aspect of the subject
• hints and answers to some selected questions have been given
• various types of questions have been incorporated in accordance with the exam pattern of the Panjab University Chandigarh; Multiple choice questions, very short questions, short questions, and long questions along for future reference
• the latest university exam question paper are added 

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