Chemical Bonding

Chemical Bonding as a chapter consists of the concepts of various types of chemical bonds and their properties. This post shall deal with this chapter as a topic for preparation of JEE Advanced and JEE Mains. The important parts of the chapter and the nature of questions shall also be discussed.

Importance

The trends from the previous years’ question paper show a very weird pattern in the number of questions that appear from Chemical Bonding. Up to 4 questions have been asked in JEE Advanced 2014, 2012, 2010 and 2007, while no questions at all were asked in 2011 and 2009. This unpredictability makes it a very risky topic to skip, and hence the smart choice would be to focus on this chapter, because a high number of questions might appear, which would help you score high marks. The trends in JEE Mains have been more regular, with an average of 2 questions being asked every year. Overall, it is a major chapter, and would require concentrated efforts to score maximum marks.

Topics

A wide variety of topics are covered under this chapter, and hence and extensive study is required. All the concepts and questions are mostly theory based, and may appear as Assertion-Reason type. The most important concept to know is that of the factors affecting formation of covalent or ionic bonds.

In the past, quite a few questions have been asked from VSEPR theory and Hund’s rule. Other topics that have appeared commonly are Bond Order calculation, hybridisation of orbitals and their characteristics. A few other concepts make an appearance in the question papers too like Paramagnetism and Dimagnetism of certain species or the different type of quantum numbers and their significance.

One last important concept to study is the shape of certain molecular species based on the filling of atoms in their orbitals.

All in all, this is a very diverse and important chapter, and needs a lot of attention and practise.