Explanation
(b) is symmetrical with linear structure and will, therefore, have zero dipole moment.
The molecular plane does not have any π-electron density.
Xe has 8 electrons in the outermost shell. In XeF2, 2 electrons of Xe are shared with two F atoms to form two covalent bonds i.e., there are 2 bond pairs. The remaining 6 electrons form 3 lone pairs. Likewise in XeF4, there are 4 bond pairs and the, remaining 4 electrons form 2 lone pairs and in XeF6, there are 6 bond pairs and the remaining two electrons form one lone pair.
A chemical bond is formed when forces of attraction are greater than the forces of repulsion.
Bond energy of sigma bond is greater than that for pi bond) (C – C = 347 kJ/mol, C = C = 619 KJ/mol i.e., for πbond, it is = 619 –347 = 272 kJ mol-1.
Bond angle of H2S is smallest because S- atom is large in size and has low electronegativity.
(b) on the basis of electronic configuration.
Overlap of s and p-orbitals along the internuclear axis leads to bonding.
Total no. of electrons in NO = 7 + 8 = 15, ClO2 = 17 + 2 × 8 = 33, CO = 6 + 8 = 14 SO2 = 16 + 2 × 8 = 32, O3 = 8 × 3 = 24 Only NO and ClO2 have odd electrons.
Both CN− and N2 molecules have the same MO diagrams but differ only in bond polarity. Thus N2 is inert due to absence of bond polarity while CN− ion is reactive due to presence of bond polarity.
Amongst HF, HCl and HBr, boiling point of HF is the highest. Out of HCl and HBr, HBr has a higher boiling point due to increase in molecule size or molecular mass. Thus, option (b) is incorrect. Rest of the options are correct.
P has one electron in the valence shell while Q has 7 and L has 4, therefore, it forms ionic compounds of the types: PQ, P2 L Futher, R has two electrons in the valence shell while Q has 7 and L has 4, therefore, it forms ionic compounds of the types : RL and RQ2. Thus option (c), i.e., P2L RL, PQ, R2Q is correct.
Smaller the size of the anion (F-) lesser is its polarization and hence more is the ionic character. Thus AICl3 is covalent while AIF6 is ionic – Fajan rule.
Here C – C contain double and triple bond.
Structure A is stable.
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