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NEET CHEMISTRYOrganic Chemistry – Some Basic Principles and Techniques Medium

Question

In which of the following molecules, all atoms are coplanar?

A
B
C

4

D

Step-by-Step Solution

  1. Condition for Coplanarity: A molecule is coplanar if all its constituent atoms lie in the same plane. This usually occurs when the central atoms are sp or sp2^2 hybridised.
  2. Examples from NCERT:
  • Benzene (C6H6C_6H_6): All six carbon atoms are sp2^2 hybridised. The overlapping of sp2sp^2 orbitals forms a hexagonal planar ring structure where all C and H atoms are in the same plane .
  • Ethene (C2H4C_2H_4): Both carbon atoms are sp2^2 hybridised. The molecule is planar with bond angles of approximately 120° .
  • BF3BF_3: The central Boron atom is sp2^2 hybridised, leading to a trigonal planar geometry .
  1. Contrast with Non-planar: Molecules with sp3^3 hybridisation, such as Methane (CH4CH_4) or Ethane (C2H6C_2H_6), possess tetrahedral or puckered geometries and are non-planar .

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.

CHEMISTRYOrganic Chemistry – Some Basic Principles and Techniques followingmoleculescoplanar

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Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)?

A.$\text{BCl}_3$ and $\text{BrCl}_3$
B.$\text{NH}_3$ and $\text{NO}_3^-$
C.$\text{NF}_3$ and $\text{BF}_3$
D.$\text{BF}_4^-$ and $\text{NH}_4^+$
MediumSolve

Among the following, isoelectronic species are:

A.$CO_{2}, NO_{2}$
B.$NO_{2}^{-}, CO_{2}$
C.$CN^{-}, CO$
D.$SO_{2}, CO_{2}$
EasySolve

Which one of the following pairs of species have the same bond order?

A.$\text{CO}$, $\text{NO}$
B.$\text{O}_2^-$, $\text{CN}^-$
C.$\text{CN}^-$, $\text{NO}^+$
D.$\text{N}^+$, $\text{CN}^+$
MediumSolve

In a regular octahedral molecule, $MX_{6}$, the number of $X–M–X$ bonds at 180º is:

A.Two
B.Six
C.Four
D.Three
EasySolve

Which of the following pairs of ions are isoelectronic and isostructural?

A.CO₃²⁻, SO₃²⁻
B.ClO₃⁻, CO₃²⁻
C.SO₃²⁻, NO₃⁻
D.ClO₃⁻, SO₃²⁻
MediumSolve

Which orbital does the additional electron occupy when $O_{2}$ is converted to the $O_{2}^{-}$ ion?

A.$\pi$ orbital
B.$\sigma^{*}$ orbital
C.$\sigma$ orbital
D.$\pi^{*}$ orbital
MediumSolve

A species that does not exhibit paramagnetism is:

A.$N_{2}^{+}$
B.$O_{2}^{-}$
C.$CO$
D.$NO$
MediumSolve

The total number of $\pi$-bond electrons in the following structure is:

A.4
B.8
C.12
D.16
EasySolve

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