Bond Order by MOT

Q.

Draw the molecular orbital diagram of ${\mathrm{N}}_2$ and calculate the bond order.

Q.

How bond order is calculated and why ${\mathrm{CO}}^{+}$ has bond order 3.5?

Q.

What is the hybridization of ${\mathrm{PCl}}_5$?

Q.

What is meant by the term bond order? Calculate the bond order of: $N_2$ , $O_2$ , $O_2^{+}$ and $O_2^{-}$ .

Q.

Use molecular orbital theory to explain why the $B{e}_2$ molecule does not exist.

Q.

Which among the following elements is not a transition metal?

1. Iron and nickel

2. Titanium and manganese

3. Scandium and vanadium

4. Zinc and cadmium

Q. What is the hybridisation of Cl in ClO2 ?Why ClO2 does not form dimer?

Q.

Which of the following bonds has the highest energy?

1. $\mathrm{O}-\mathrm{O}$

2. $\mathrm{S}-\mathrm{S}$

3. $\mathrm{Se}-\mathrm{Se}$

4. $\mathrm{Te}-\mathrm{Te}$

Q.

Question 23

Which of the following have identical bond order?

(a) $C{N}^{-}$

(b) $N{O}^{+}$

(c) $O_2^{-}$

(d) $O_2^{2-}$

Q.

The Styx number for ${\mathrm{B}}_2{\mathrm{H}}_6$ is

1. $2002$

2. $2012$

3. $2201$

4. $2102$

Q.

What is the weakest bond?

Q. In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed ?

1. $N_2\to N_2^{+}$
2. $C_2\to C_2^{+}$
3. $NO\to N{O}^{+}$
4. $O_2\to O_2^{+}$

Q. Why CO is stronge ligand?

Q.

Define Group B elements of the Periodic table.

Q. Bond order of $B{e}_2$ is:

1. 1
2. 2
3. 3
4. \N

Q.

The species having bond order different from that in CO is:

1. NO^-

2. NO⁺

3. CN^-

4. N₂

Q. Which of the following facts regarding change in bond length is correct?

1. Increases in going from $N_2$ to $N_2^{+}$, decreases in going from $O_2$ to $O_2^{+}$
2. Decreases in going from $N_2$ to $N_2^{+}$, decreases in going from $O_2$ to $O_2^{+}$
3. Increases in going from $N_2$ to $N_2^{+}$ and $O_2$ to $O_2^{+}$
4. Decreases in going from $N_2$ to $N_2^{+}$ and $O_2$ to $O_2^{+}$

Q.

How would the bond length vary in dicarbon species${\mathrm{C}}_2,{{\mathrm{C}}_2}^{+},{{\mathrm{C}}_2}^{-}$

Q.

Na= Nb wat is the stability in MOT?

Q.

Bond order normally gives an idea of the stability of a molecular species. All the molecules viz. ${\mathrm{H}}_2,{\mathrm{Li}}_2\mathrm{and}{\mathrm{B}}_2$ have the same bond order yet they are not equally stable. Their stability order is:

1. ${\mathrm{H}}_2>{\mathrm{B}}_2>{\mathrm{Li}}_2$

2. ${\mathrm{H}}_2>{\mathrm{Li}}_2>{\mathrm{B}}_2$

3. ${\mathrm{Li}}_2>{\mathrm{B}}_2>{\mathrm{H}}_2$

4. ${\mathrm{B}}_2>{\mathrm{H}}_2>{\mathrm{Li}}_2$

Q. A homonuclear diatomic gas molecule shows 2 electron magnetic moment. The one-electron and two-electron reduced species obtained from above gas molecule can act as both oxidizing and reducing agents. When the gas molecule is one-electron oxidized the bond length decreases compared to the neutral molecule. The gas molecule is:

1. $N_2$
2. $C{l}_2$
3. $O_2$
4. $B_2$

Q. The correct bond order in the following species is :

1. $O_2^{-}<O_2^{+}<O_2^{2+}$
2. $O_2^{2+}<O_2^{+}<O_2^{-}$

3. $O_2^{+}<O_2^{-}<O_2^{2+}$

4. $O_2^{2+}<O_2^{-}<O_2^{+}$

Q. Assertion: \(N_{2}\) is less reactive than \(P_{4}\).
Reason: Nitrogen has more electron gain enthalpy than Phosphorus.

Q. Despite their $-I$ effect, halogens are 𝑜- and 𝑝- directing in haloarenes. Explain.

Q. Which of the following pairs of species have the same bond order?

1. $CO,NO$
2. $O_2,N{O}^{+}$
3. $C{N}^{-},CO$
4. $N_2,O_2^{-}$

Q. Give reason to explain why $Cl{F}_3$ exists but $FC{l}_3$ does not exist.

Q. According to MOT, which of the following species has only $\pi$ electrons involved in bonding?

1. $C_2$
2. $N_2$
3. $O_2$
4. $B_2$

Q.

Question 20

Which of the following options represents the correct bond order?

(a) $O_2^{-}>O_2>O_2^{+}$

(b) $O_2^{-}<O_2<O_2^{+}$

(c) $O_2^{-}>O_2<O_2^{+}$

(d) $O_2^{-}<O_2>O_2^{+}$

Q.

The atoms of elements belonging to same group of the periodic table have same number of

1. Protons

2. Electrons

3. Neutrons

4. Electrons in the outermost shell

Q.

Dimer formation can take place with

1. NO₂
2. BH₃
3. AlCl₃
4. All of these