For the following molecules : PCl5, BrF3, ICl2^-, XeF5^-, NO3^-, XeO2F2, PCl4^+, CH3^+ Calculate the value of (a + b) / c. a = Number of species having sp^3d-hybridisation. b = Number of species which

Question

For the following molecules : PCl5, BrF3, ICl2^-, XeF5^-, NO3^-, XeO2F2, PCl4^+, CH3^+ Calculate the value of (a + b) / c. a = Number of species having sp^3d-hybridisation. b = Number of species which are planar. c = Number of species which are non-planar.

Prashant Kotian · Accepted Answer

Correct answer: 3. Step 1: Categorize the solids formed by each substance: Si forms a giant 3D covalent network; KCl is an ionic lattice; CH3OH is a polar molecular solid with hydrogen bonding; C2H6 is a non-polar molecular solid with dispersion forces. Step 2: Covalent network solids (Si) have the highest melting points, followed by ionic solids (KCl). Among the molecular solids, the hydrogen-bonded CH3OH has a higher melting point than the non-polar C2H6. Step 3: This results in the correct increasing melting point order: C2H6 < CH3OH < KCl < Si.

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