NEET 2026 ALL Q #1989
COMPETENCY BASED
APPLY
4 Marks 2026 NTA-RE-NEET-2026 MCQ SINGLE
Match the species in List-I with their geometry in List-II.
List-I:
A. $PCl_{5}$
B. $BrF_{5}$
C. $BF_{4}^{-}$
D. $[Ni(CN)_{4}]^{2-}$
List-II:
I. Tetrahedral
II. Square Planar
III. Trigonal bipyramidal
IV. Square pyramidal
Choose the correct answer from the options given below:
(A) A-III, B-II, C-I, D-IV
(B) A-IV, B-III, C-I, D-II
(C) A-III, B-IV, C-I, D-II
(D) A-III, B-I, C-II, D-IV
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Correct Answer: C

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Detailed Solution

Step 1: Analyze $PCl_{5}$

The central atom Phosphorus has 5 valence electrons and forms 5 bonds with Chlorine atoms. Using VSEPR theory, the steric number is 5 ($sp^{3}d$ hybridization), which corresponds to a Trigonal bipyramidal geometry (A-III).

Step 2: Analyze $BrF_{5}$

Bromine has 7 valence electrons. It forms 5 bonds with Fluorine and has 1 lone pair. The steric number is 6 ($sp^{3}d^{2}$ hybridization). With 5 bond pairs and 1 lone pair, the geometry is Square pyramidal (B-IV).

Step 3: Analyze $BF_{4}^{-}$

Boron has 3 valence electrons. In $BF_{4}^{-}$, it forms 4 bonds. The steric number is 4 ($sp^{3}$ hybridization), which corresponds to a Tetrahedral geometry (C-I).

Step 4: Analyze $[Ni(CN)_{4}]^{2-}$

Nickel is in the +2 oxidation state ($d^{8}$ configuration). $CN^{-}$ is a strong field ligand, causing pairing of electrons. This results in $dsp^{2}$ hybridization, which corresponds to a Square planar geometry (D-II).

Final Answer: A-III, B-IV, C-I, D-II

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student must apply VSEPR theory and Valence Bond Theory principles to determine the molecular geometry of diverse chemical species.
Knowledge Dimension: PROCEDURAL
Justification: The student must follow a specific algorithmic process (calculating steric number, identifying hybridization, and accounting for lone pairs) to arrive at the correct structural classification.
Syllabus Audit: In the context of NEET, this is classified as COMPETENCY. This question tests the ability to integrate knowledge of Chemical Bonding and Coordination Chemistry, which is a high-yield area for competitive medical entrance exams.

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