Given below are two statements: Statement I: The number of species among $\mathrm{SF}_{4}$, $\mathrm{NH}_{4}^{+}$, $[\mathrm{NiCl}_{4}]$, $\mathrm{XeF}_{4}$, $[\mathrm{PtCl}_{4}]^{2-}$, $\mathrm{SeF}_{4}$ and $[\mathrm{Ni}(\mathrm{CN})_{4}]^{2-}$, that have tetrahedral geometry is 3. Statement II: In the set $[\mathrm{NO}_{2}, \mathrm{BeH}_{2}, \mathrm{BF}_{3}, \mathrm{AlCl}_{3}]$, all the molecules have incomplete octet around central atom. In the light of the above statements, choose the correct answer from the options given below:

(C) Statement I is false but Statement II is true

(A) Statement I is true but Statement II is false

(B) Both Statement I and Statement II are false

(D) Both Statement I and Statement II are true

JEE Main · 2026 · 21 Jan 2026 · Shift 1 · Chemical Bonding and Molecular Structure

Given below are two statements:

Statement I: The number of species among

SF_{4}

NH_{4}^{+}

[NiCl_{4}]

XeF_{4}

[PtCl_{4}]^{2 -}

SeF_{4}

and

[Ni (CN)_{4}]^{2 -}

, that have tetrahedral geometry is 3.

Statement II: In the set

[NO_{2}, BeH_{2}, BF_{3}, AlCl_{3}]

, all the molecules have incomplete octet around central atom.

In the light of the above statements, choose the correct answer from the options given below:

(A)Statement I is true but Statement II is false
(B)Both Statement I and Statement II are false
(C)Statement I is false but Statement II is true✓ Correct
(D)Both Statement I and Statement II are true

Answer: (C)

Solution

Counting the tetrahedral species: NH

_{4}^{+}

(sp

^{3}

) and

[NiC l_{4}]^{2 -}

(sp

^{3}

, high spin) are tetrahedral, whereas SF

_{4}

and SeF

_{4}

are see-saw and XeF

_{4}

[PtC l_{4}]^{2 -}

and

[Ni (CN)_{4}]^{2 -}

are square planar. Only 2 species are tetrahedral, not 3, so Statement I is false. In the second set NO

_{2}

has 7 electrons on nitrogen, BeH

_{2}

has 4 on beryllium, BF

_{3}

has 6 on boron and AlCl

_{3}

has 6 on aluminium, so every molecule has an incomplete octet around the central atom, making Statement II true. Statement I is false but Statement II is true.

JEE Main · 2026 · 21 Jan 2026 · Shift 1 · Single correct option

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JEE Main · 2026 · 21 Jan 2026 · Shift 1 · Chemical Bonding and Molecular Structure

Solution

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