The bond lengths (in pm ) of C - C , C ≡ C and C = C are:

C - C C ≡ C C = C 154 120 133

C - C C ≡ C C = C 120 154 133

C - C C ≡ C C = C 154 120 139

C - C C ≡ C C = C 140 133 139

HARD

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Statement-I. $H_{2}$ molecule is more stable than $HeH$ molecule.

Statement-2. The antibonding electron in the molecule destabilises it.

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Important Questions on Chemical Bonding and Molecular Structure

EASY

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

The intermolecular potential energy for the molecules

A

B

C

and

D

given below suggests that:
Question Image

EASY

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

After understanding the assertion and reason, choose the correct option.

Assertion: In the bonding molecular orbital (MO) of

H_{2},

electron density is increased between the nuclei.
Reason: The bonding MO is

ψ_{A} + ψ_{B}

, which shows destructive interference of the combining electron waves.

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

The correct order of

C - O

bond length is:

EASY

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

How many ions of the following have a bond order of $2.5 ?$

$N_{2}^{-}; {NO}^{-}; C_{2}^{-}; N_{2}^{+}; C_{2}^{2 -}; {CN}^{+}$

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

Among the following molecules, the one with the largest bond angle at the central atom is

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

Average bond enthalpy of water is

464 \cdot 5 kJ {mol}^{- 1}

. If the energy required to break first

O - H

bond is

502 kJ {mol}^{- 1}

, how much energy per mol is required to break second

O - H

bond ?

EASY

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

The number of

π

-bonds and

σ

-bonds present in naphthalene are respectively

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

Among the following species, the

H - X - H

angle (

X = B, N

P

) follows the order.

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

If enthalpy of atomization for

B r_{2} (l)

x k J / m o l

and bond enthalpy for

B r_{2}

y k J / m o l

, the relation between them

EASY

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

Arrange the following compounds in increasing order of

C - O H

bond length: methanol, phenol,

p

-ethoxyphenol

EASY

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

Bond lengths (in

pm

) of

C - H, C - C, C = C

and

C \equiv C

bonds, respectively are:

EASY

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

According to molecular orbital theory, which of the following is true with respect to

{Li}_{2}^{+}

and

{Li}_{2}^{-}

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

The bond lengths (in $pm)$ of $C - C, C \equiv C$ and $C = C$ are:

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

The compound that has the largest

H - M - H

bond angle

(M = N, O, S, C)

, is :

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

In which of the following the

C - H

bond distance is the longest?

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

The correct order of bond dissociation enthalpy of halogens is:

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

Pick the INCORRECT statement among those given below

HARD

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

The number of bonds between sulphur and oxygen atoms in

S_{2} O_{8}^{2 -}

and the number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectively are:

MEDIUM

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

Maximum bond angle at nitrogen is present in which of the following?

HARD

Chemistry>Inorganic Chemistry>Chemical Bonding and Molecular Structure>Bond Parameters

Decreasing order of stability of $O_{2}, O_{2}^{-}, O_{2}^{+}$ and $O_{2}^{2 -}$ is:

Statement-I. H2 molecule is more stable than HeH molecule. Statement-2. The antibonding electron in the molecule destabilises it.

Important Questions on Chemical Bonding and Molecular Structure

Learn and Prepare for any exam you want !

Statement-I. $H_{2}$ molecule is more stable than $HeH$ molecule.

Statement-2. The antibonding electron in the molecule destabilises it.