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Chemical Bonding and Molecular Structure

Multiple Choice Questions

441.

Which of the following elements can be involved in $pπ - dπ$ bonding?

Carbon
Nitrogen
Phosphorus
Boron

442.

Which one ofthe following statements about C₂ molecule is wrong?

The bond order of C₂ is 2.
In vapour phase, C₂ molecule is diamagnetic.
Double bond in C₂molecule consists of both $π$ - bonds because of the presence of 4 $e_{s}^{-}$ in two $π$ - molecular orbitals.
double bond in C₂ molecule consists of one $σ$ - bond and on $π$ -bond.

443.

The type of hybridisation in SF₆, molecule is

sp³d
dsp³
sp³d
d²sp³

444.

Among LiCl, BeCl₂, BCl₃ and CCl₄ the covalent bond character follows the order

LiCl < BeCl₂ < BCl₃ < CCl₄
BCl₃ < CCl₄ < BeCl₂ < LiCl
BeCl₂ < LiCl < CCl₄ < BCl₃
CCl₄ < BCl₃ < BeCl₂ < LiCl

445.

Which of the following has sp²-hybridisation?

C₂H₆
C₂H₄
BeCl₂
C₂H₂

446.

An sp³-hybrid orbital contains

$\frac{1}{4} s - character$
$\frac{1}{2} s - character$
$\frac{2}{3} s - character$
$\frac{3}{4} s - character$

447.

Hybridisation states of C in CH $_{3}^{+}$ and C $H_{3}^{-}$ are

sp², sp³
sp³, sp²
sp, sp²
sp², sp

448.

Which one of the following complexes is outer orbital complex?

[Co(NH₃)₆]³⁺
[Mn(CN)₆]⁴⁺
[Fe(CN)₆]^4-
[Ni(NH₃)₆]²⁺

449.
The correct statement with regard to $H_{2}^{+}$ and $H_{2}^{-}$ is

both H $_{2}^{+}$ and H $_{2}^{-}$ are equally stable

both H $_{2}^{+}$ and H $_{2}^{-}$ do not exist

H $_{2}^{-}$ is more stable than H $_{2}^{+}$

H $_{2}^{+}$ is more stable than H $_{2}^{-}$

H $_{2}^{+}$ is more stable than H $_{2}^{-}$

The correct statement with regard to $H_{2}^{+}$ and $H_{2}^{-}$ is, former is more stable than later.

$H_{2}^{+} : σ 1 s^{1}, σ 1 s^{°} Bond order = \frac{1}{2} H_{2}^{-} : σ 1 s^{2}, σ 1 s^{1} Bond order = \frac{2 - 1}{2} = \frac{1}{2}$

The bond order of H $_{2}^{+}$ and H $_{2}^{-}$ are same. It is due to the presence of one electron in the antibonding molecular orbital in H $_{2}^{-}$ .