Solved: CHEMISTRY Question for NEET | Sushrut

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NEET CHEMISTRYMedium

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

A

B

C

4

D

Step-by-Step Solution

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 sp $^2$ hybridised.
Examples from NCERT:

Benzene ( $C_6H_6$ ): All six carbon atoms are sp $^2$ hybridised. The overlapping of $sp^2$ orbitals forms a hexagonal planar ring structure where all C and H atoms are in the same plane .
Ethene ( $C_2H_4$ ): Both carbon atoms are sp $^2$ hybridised. The molecule is planar with bond angles of approximately 120° .
$BF_3$ : The central Boron atom is sp $^2$ hybridised, leading to a trigonal planar geometry .

Contrast with Non-planar: Molecules with sp $^3$ hybridisation, such as Methane ( $CH_4$ ) or Ethane ( $C_2H_6$ ), possess tetrahedral or puckered geometries and are non-planar .

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