Given below are two statements : Statement I : The number of species among SF _ 4 , NH _ 4 ^ + , [ NiCl _ 4 ]^ 2- , 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 :
B. Statement I is false but Statement II is true
Statement I: Checking geometry of each species: SF_4: 4 bp + 1 lp → see-saw NH_4^+: 4 bp → tetrahedral [NiCl_4]^ 2- : Ni^ 2+ (d⁸) with weak field Cl^- → sp^3 → tetrahedral XeF_4: 4 bp + 2 lp → square planar [PtCl_4]^ 2- : Pt^ 2+ (d⁸) → dsp^2 → square planar SeF_4: 4 bp + 1 lp → see-saw [Ni(CN)_4]^ 2- : Ni^ 2+ with strong field CN^- → dsp^2 → square planar Only 2 species are tetrahedral. Statement I is false. Statement II: NO_2 (odd electron), BeH_2 (4e⁻), BF_3 (6e⁻), AlCl_3 (6e⁻) all have incomplete octet. Statement II is true.
Related: Chemistry — Chemical Bonding and Molecular Structure · All PYQ Banks