The lone pairs in the BrF3 molecule, occupy equatorial positions to minimize:
1. | Bond pair – bond pair repulsion only |
2. | Lone pair – lone pair repulsion and lone pair–bond pair repulsion |
3. | Lone pair – lone pair repulsion only |
4. | Lone pair – bond pair repulsion only |
The dipole moment of compound AB is 10.92 D and that of compound CD is 12.45 D. If the bond length of AB is 2.72 A° and that of CD is 2.56 A°, then for these compounds the correct statement is:
1. More ionic nature in AB
2. More ionic nature in CD
3. Equal in both
4. Cannot be predicted
Among the following, iso-electronic species are:
1. CO2, NO2
2. , CO2
3. CN–, CO
4. SO2, CO2
In NO3– ion, the number of bond pair and lone pair of electrons on nitrogen atom are respectively:
1. | 2, 2 | 2. | 3, 1 |
3. | 1, 3 | 4. | 4, 0 |
Incorrect statement about peptide bond is:
1. | C–N bond length in proteins is longer than the usual bond length of N-bond. |
2. | Spectroscopic analysis shows the planar structure of group. |
3. | C–N bond length in proteins is smaller than the usual bond length of the C–N bond. |
4. | None of the above. |
Which of the following two species in the pair are isostructural:
1.
2.
3.
4.
The incorrect statements among the following for sigma- and pi- bonds formed between two carbon atoms is:
1. | Sigma-bond is stronger than a pi-bond |
2. | Bond energies of sigma- and pi-bonds are of the order of 264 KJ/mol and 347 KJ/mol, respectively |
3. | Free rotation of atoms about a sigma bond is allowed but not in the case of a pi-bond |
4. | Sigma-bond determines the direction between carbon atoms but a pi-bond has no primary effect in this regard |
If the main axis of a diatomic molecule is z, then the molecular orbital px and py overlap to form which of the following orbital:
1. molecular orbtial
2. σ molecular orbital
3. δ molecular orbtial
4. No bond will form