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NEET CHEMISTRYOrganic Chemistry – Some Basic Principles and Techniques Medium

Question

The pair of electrons in the given carbanion, CH3C≡C−\text{CH}_3\text{C}\equiv\text{C}^-, is present in which of the following orbitals?

A

sp3sp^3

B

sp2sp^2

C

spsp

D

2p2p

Step-by-Step Solution

In the carbanion CH3−C≡C−\text{CH}_3-\text{C}\equiv\text{C}^-, the terminal carbon atom is bonded to the adjacent carbon atom by a triple bond (which consists of one σ\sigma bond and two π\pi bonds) and possesses one lone pair of electrons (indicated by the negative charge). The steric number for this carbon atom is the sum of the number of σ\sigma bonds and the number of lone pairs, which is 1+1=21 + 1 = 2. A steric number of 2 corresponds to spsp hybridisation. Therefore, the lone pair of electrons resides in an spsp hybrid orbital.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Organic Chemistry – Some Basic Principles and Techniques . Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

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