Resonance

Q.

What is meant by term bond order? Write bond orders for ${\mathrm{N}}_2,{\mathrm{O}}_2$?

Q. Bond order of O-O bond in ozone molecule is

1. $1.5$
2. $1.33$
3. $1$
4. $2$

Q. 68.Draw the structure of molecular orbital of O2.

Q. 41. Lithium selenide can be described as a closest packed array of selenide ions with lithium ions in all the tetrahedral holes.Formula of lithium selenide is (1)Li2Se (2)LiSe (3)LiSe2 (4)Li3Se

Q. 48. Lewis dot structure of N2O. And formal charge on each atom.

Q. Phenyl ring is known to exert negative inductive effect but each phenyl ring in biphenyl (C_6H_5-C_6H_5) is more reactive than benzene towards electophilic substitution-Explain.

Q.

Point out incorrect statement about resonance

1. Resonance structures should have equal energy

2. In resonance structures, the constituent atoms should be in the same position

3. In resonance structures, there should not be the same number of electron pairs

4. Resonance structures should differ only in the location of electrons around the constituent atoms

Q. 12. In an oxide, oxide ions are packed with fcc unit cell in which B3+ ion occupy x% of octahedral void and A2+ ion occupy y% of tetrahedral void, then what is correct about the unit cell? 1.) Formula is A3B2O6 in which x=50% and y=12.5% 2.) Formula is A2B4O6 in which x=50% and y=50% 3.) Formula is AB2O4 in which X! 50% and y=12.5% 4.) Formula is AB2O4 in which x=12.5% and y=50%

Q. 21.How many other major contributing resonance saruures are posible for the following heterocycle? (a)2 (b) 4 (c) 6 (d) 8

Q. How many resonating structures can be made in case of C6H5OH and how?

Q. Intermolecular hydrogen bonding is strongest in (1) Methylamine (2) Phenol (3) Formaldehyde (4) Methanol

Q.

A polar covalent bond will be formed in which one of these pair of atoms:

1. H₂

2. Cl₂

3. HF

4. N₂

Q. Assertion: All F-S-F angle in SF_2 is greater than 90^o but less than 180^o. Reason:The lone pair-bond pair repulsion is weaker than bond pair-bond pair repulsion

Q.

Which of the following molecules is the least resonance stabilized?

1. 

2. 

3. 

4. 

Q. 20. Assertion and reason (A) All F-S-F angle in SF4 greater than 90 degree but less than 180 degree (R) the lone pair-bond pair repulsion is weaker than bond pair-bond pair repulsion

Q.

Which of the following has the highest bond order?

1. ${\mathrm{H}}_2$

2. ${\mathrm{O}}_2$

3. ${\mathrm{N}}_2$

4. ${\mathrm{He}}_2$

Q. In the following molecule, the $C_2-C_3$ bond length is shorter than the usual $C-C$ bond length. The reason for this observation is ______
$C=\underset{\left(2\right)}{C}-\underset{\left(3\right)}{C}=C$

1. Odd electrons

2. Incomplete octet

3. Resonance

4. Extented Octet

Q.

What is the name of the cyclohexane conformation?

1. Chair

2. Half chair

3. Twist Boast

4. Boat

5. Anti

Q.

Among the following compounds intramolecular hydrogen bonding is present in:

1. H₂O

2. HF

3. p-nitro phenol

4. o-nitro phenol

Q. in which of the following bond angle is maximum? (1)NH_3 (2)PCl_{4^{}}+ (3) BCl_3 (4)PCl_{

Q. Which of the following bonds/forces is the weakest?

1. Covalent bond
2. Ionic bond
3. Hydrogen bond
4. London force

Q. 24. What is the formal charge of central atom BH4 power negative

Q. 38. number of nodal plane in the molecular orbitals of 1) 1s + 1s 2) 1s - 1s 3) 2pz + 2pz 4) 2pz - 2pz

Q. 1.What will be the orbital diagram of oxygen

Q. A sigma bonded molecule MX3 is T shaped the number of non bonding pairs of electrons

Q. how does 2 resonance structure having same energy provide stability to structure ie actual

Q. For diatomic molecule the dipole moment is 1.2D and bond length is 1×10^{-10}m then charge fraction on each atom is 1)12% 2)18% 3)25% 4)29

Q. Strength of acidic nature is in order.

1. II > I > III > IV
2. III > IV > I > II
3. I > IV > III > IV
4. IV> III > I > II

Q. 2. In certain solidthe oxide ions are arranged in CCP cation a ocvupy 1/6 pgf tetrahedral void a n cation b occupy 1 third of octahedral void formula of compond is .

Q. When ethyne is treated with AsCl_3 gives