Which one of the following compounds has - hybridisation?
1
2
3
4
Official Solution
Correct Option:
(2)
In molecule, is hybridised
02
PYQ 2011
hard
chemistryID: wbjee-20
The hybridization of central atom of a molecule would lead to
1
square planar geometry
2
tetrahedral geometry
3
trigonal bipyramidal geometry
4
octahedral geometry
Official Solution
Correct Option:
(4)
The and hybridization of central atom leads to octahedral geometry.
03
PYQ 2012
medium
chemistryID: wbjee-20
The state of hybridization of the central atom and the number of lone pairs over the central atom in are
1
2
3
4
Official Solution
Correct Option:
(3)
bonds hybridisation without lone pair of electrons.
04
PYQ 2022
medium
chemistryID: wbjee-20
Hybridisation of the negative carbons in (1) and (2) are:
1
sp2 and sp3
2
sp3 and sp2
3
both sp2
4
both sp3
Official Solution
Correct Option:
(1)
The correct answer is sp2 and sp3.
Here's why:
Hybridization and Carbanions: A carbanion is a carbon atom with a negative charge and three substituents. The hybridization depends on whether the lone pair on the carbon is involved in resonance.
Structure (1): In structure (1), the carbanion is directly attached to a carbonyl group. The negative charge can delocalize into the carbonyl group through resonance: This resonance delocalization makes the carbanion sp2 hybridized. The carbon has 3 sigma bonds and 0 lone pair. The lone pair participates in pi-bonding.
Structure (2): In structure (2), the carbanion is attached to 3 other atoms with single bonds. Therefore, it is sp3 hybridized. The carbon has 3 sigma bonds and 1 lone pair.
Therefore, the hybridization of the negatively charged carbons in (1) and (2) are sp2 and sp3, respectively.
Correct Answer: sp2 and sp3
About Hybridisation - WBJEE
Hybridisation is a vital chapter for WBJEE aspirants. Mastering the concepts covered in this chapter is essential for securing a top rank.
By rigorously practicing the previous year questions associated with this chapter, you can identify high-yield topics, understand the examiner's perspective, and boost your confidence during the actual exam.
Frequently Asked Questions
Why focus on Hybridisation PYQs?
Analyzing PYQs for this specific chapter reveals the most frequently tested concepts and the typical complexity of questions, allowing you to tailor your study plan efficiently.
How to best use this analysis?
Review the topic breakdown to see which sub-topics within Hybridisation carry the most weight. Then, tackle the questions iteratively to solidify your understanding.
