Chemical Bonding Test

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Chemical Bonding Test - 11

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Weekly Quiz Competition

Question 1
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Statement-1: Keto and enol are two cannonical forms.

Statement-2: Keto and enol forms exist in dynamic equilibrium with each other.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

B
Statement-1 is false but Statement-2 is true.

C
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

D
Statement-1 is true but Statement-2 is false.

Solution

Keto and enol are two tautomeric forms and not cannonical forms. Cannonical forms do not exist in equilibrium with each other.

The correct answer is: Statement-1 is false but Statement-2 is true.
Question 2
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Statement-1: Bond energy and bond dissociation energy has identical value for diatomic molecules.

Statement-2: Greater the bond dissociation energy, less reactive is the bond.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

Bond dissociation energy is the energy required to break a particular bond in on mole of a gaseous molecule. Bond energy is the average values of dissociation energies of the same type of bond present in the molecule. Bond energy of C-H bond in methane is 99.2 Kcal/mol. Thus for polyatomic molecules, average bond energy is taken as the dissociation bond energy.

The correct answer is: Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.
Question 3
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Homolytic fission of C–C bond in ethane gives an intermediate, in which carbon atom is

A
sp³ hybridised

B
not hybridized

C
sp hybridised

D
sp² hybridised

Solution

The intermediate product is methyl free radical C^˙H₃ which is sp² hybridised and has trigonal planar shape. The odd electron remains in the p-orbital of C-atom.

The correct answer is: sp² hybridised
Question 4
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Directions For Questions

Molecular orbital theory describes bonding in terms of the combination and arrangement of atomic orbitals to form molecular orbitals that are associated with the molecule as a whole.

The number of molecular orbitals formed is equal to the number of combining atomic orbitals. When two atomic orbitals combine, two molecular orbitals called bonding molecular orbital and anti-bonding molecular orbital are formed. The two atomic orbitals so formed by LCAO (Linear Combination of Atomic Orbitals) are in the same phase (bonding molecular orbital) or in different phase (anti-bonding molecular orbital). The energy of bonding molecular orbital is lower than that of the pure atomic orbital by an amount Δ, which is known as stabilization energy. The energy associated with antibonding molecular orbital is higher than that associated with pure atomic orbital by an amount Δ which is known as destablization energy. In bonding molecular orbitals the inter-electronic attraction is present whereas in anti-bonding molecular orbital we find an inter electronic repulsion.

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On the basis of molecular orbital theory which of the following statements is correct?

A
The bond length increases with increase in bond order

B
The bond length decreases with increase in bond order

C
The bond length is not affected due to change in bond order

D
The bond length sometimes increases and sometimes decreases with increase in bond order

Solution

As the bond order increases, there will be a decrease in bond length.
Question 5
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In which of the following compound, two ions composed of non-metal atoms combine to form an ionic compound?

A
NH₄NO₃

B
Al₂(SO₄)₃

C
CH₃COOH

D
CH₃CN

Solution

Both the cation (NH⁺₄) and anion (NO^-₃) are composed of non-metals.

The correct answer is: CH₃CN

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Re-Attempt Weekly Quiz Competition

Chemical Bonding Test - 11

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Chemical Bonding Test - 11

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Question 1

Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

Statement-1 is false but Statement-2 is true.

Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

Statement-1 is true but Statement-2 is false.

Solution

Question 2

Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

Statement-1 is true but Statement-2 is false.

Statement-1 is false but Statement-2 is true.

Solution

Question 3

sp3 hybridised

not hybridized

sp hybridised

sp2 hybridised

Solution

Question 4

The bond length increases with increase in bond order

The bond length decreases with increase in bond order

The bond length is not affected due to change in bond order

The bond length sometimes increases and sometimes decreases with increase in bond order

Solution

Question 5

NH4NO3

Al2(SO4)3

CH3COOH

CH3CN

Solution

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sp³ hybridised

sp² hybridised

NH₄NO₃

Al₂(SO₄)₃

CH₃COOH

CH₃CN