Predict the correct order among the following.

(1) lone pair-lone pair>bond pair-bond pair>lone pair-bond pair

(2) bond pair-bond pair>lone pair-bond pair>lone pair-lone pair

(3) lone pair-bond pair>bond pair-bond pair>lone pair-lone pair

(4) lone pair-lone pair>lone pair-bond pair>bond pair-bond pair

The pair of electrons in the given carbanion, CH₃C≡C^-, is present in which of the following orbitals?

The incorrect statement among the following regarding the molecules of CH_4, NH₃, and H₂O is:

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

1. Cl₂ > Br₂ > F₂ > I₂

2. Br₂ > I₂ > F₂ > Cl₂

3. F₂ > Cl₂ > Br₂ > I₂

4. I₂ > Br₂ > Cl₂ > F₂

Which of the following species contains equal number of $\mathrm{\sigma }$ and $\mathrm{\pi }$ bonds?

1. ${\mathrm{HCO}}_3^{-}$                                   

2. XeO₄

3. (CN)₂                                     

4. CH₂(CN)₂

The correct bond order in the following species is

1. ${\mathrm{O}}_2^{2+}>{\mathrm{O}}_2^{+}>{\mathrm{O}}_2^{-}$

2. ${\mathrm{O}}_2^{2+}<{\mathrm{O}}_2^{-}<{\mathrm{O}}_2^{+}$

3. ${\mathrm{O}}_2^{+}>{\mathrm{O}}_2^{-}<{\mathrm{O}}_2^{2+}$

4. ${\mathrm{O}}_2^{-}<{\mathrm{O}}_2^{+}>{\mathrm{O}}_2^{2+}$

The total number of $\mathrm{\pi }$-bond electrons in the following structure is

1. 4       

2. 8         

3. 12         

4. 16

In which of the following pairs, both the species are not isostructural?

1. ${\mathrm{SiCl}}_4, {\mathrm{PCl}}_4^{+}$

2. Diamond, silicon carbide

3. ${\mathrm{NH}}_3, {\mathrm{PH}}_3$

4. ${\mathrm{XeF}}_4, {\mathrm{XeO}}_4$

Decreasing order of stability of ${\mathrm{O}}_2, {\mathrm{O}}_2^{-}, {\mathrm{O}}_2^{+} \mathrm{and} {\mathrm{O}}_2^{2-} \mathrm{is:}$

1. ${\mathrm{O}}_2^{+} > {\mathrm{O}}_2 > {\mathrm{O}}_2^{-} > {\mathrm{O}}_2^{2-}$

2. ${\mathrm{O}}_2^{2-} > {\mathrm{O}}_2^{-} > {\mathrm{O}}_2^{} > {\mathrm{O}}_2^{+}$

3. ${\mathrm{O}}_2^{} > {\mathrm{O}}_2^{+} > {\mathrm{O}}_2^{2-} > {\mathrm{O}}_2^{-}$

4. ${\mathrm{O}}_2^{-} > {\mathrm{O}}_2^{2-} > {\mathrm{O}}_2^{+} > {\mathrm{O}}_2^{}$

A molecule having the maximum dipole moment among the following is -

1. CO₂

2. CH₄

3. NH₃

4. NF₃