Which of the following two molecular species are Diamagnetic in nature?
$$[\mathrm{A}]=\mathrm{O}_2^{-} \quad[\mathrm{B}] .=\mathrm{N}_2^{+} \quad[\mathrm{C}]=\mathrm{C}_2 \quad[\mathrm{D}]=\mathrm{O}_2{ }^{2-}$$
Choose the incorrect statement from the following:
A. Isoelectronic molecules/ions have the same bond order.
B. Dipole moment of $$\mathrm{NH}_3$$ is greater than that of $$\mathrm{NF}_3$$.
C. The Carbon in Methyl Carbocation is $$\mathrm{sp}^3$$ hybridised.
D. The stability of an ionic compound is measured in terms of its lattice enthalpy and not simply based on attaining Octet configuration.
On the basis of VSEPR theory, match the molecules listed in Column I with their shapes given in Column II.
| No. | Column I | No. | Column II |
|---|---|---|---|
| A | $$\mathrm{ClF_3}$$ | P | Sea saw |
| B | $$\mathrm{BrF_5}$$ | Q | Pentagonal bipyramidal |
| C | $$\mathrm{SF_4}$$ | R | Square pyramidal |
| D | $$\mathrm{IF_7}$$ | S | T-shaped |
Identify the pair of molecules, both of which have positive values of Dipole moment.