Why does sulphur trioxide (SO₃) acts as an electrophile?

Important Questions on Basic Principles of Organic Chemistry

EASY

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

In the molecular orbital diagram for the molecular ion ${\mathrm{N}}_2^{+}$ , the number of electrons in the ${\mathrm{\sigma }}_{2\mathrm{p}}$ molecular orbital is

HARD

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

Which of the following options represents the correct bond order?

MEDIUM

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

Consider the following species:

(i) $O_2^{2-}$

(ii) $C{O}^{+}$

(iii) $O_2^{+}$

Among the following, sigma bond alone is present in -

EASY

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

Which one of the following molecules is expected to exhibit paramagnetic behaviour?

HARD

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic?

EASY

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

The diamagnetic species is:

EASY

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

Which of the following species is not paramagnetic?

MEDIUM

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

Which one of the following molecules is paramagnetic?

MEDIUM

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

Two pi and half sigma bonds are present in:

EASY

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

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

Assertion: In the bonding molecular orbital (MO) of ${\text{H}}_2,$ electron density is increased between the nuclei.
Reason: The bonding MO is ${\mathrm{\text{ψ}}}_{\mathrm{\text{A}}}+{\mathrm{\text{ψ}}}_{\mathrm{\text{B}}}$ , which shows destructive interference of the combining electron waves.

EASY

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

Stability of the species  ${\text{Li}}_2\text{,}{\text{Li}}_2^{-}\text{and}{\text{Li}}_2^{+}$ increases in the order of

EASY

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

According to molecular orbital theory, which of the following is true with respect to ${\mathrm{Li}}_2^{+}$ and ${\mathrm{Li}}_2^{-}$ ?

EASY

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

Which of the following is paramagnetic?

MEDIUM

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

In which of the following pairs of molecules/ions, both the species are not likely to exist?

EASY

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

Which one of the following pairs of species has the same bond order?

MEDIUM

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

Which of the following has unpaired electron(s)?

MEDIUM

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

Which one of the following properties is not shown by NO ?

MEDIUM

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

The correct bond order in the following species is:

MEDIUM

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

Consider the following species,

${\mathrm{CN}}^{+},\mathrm{ }{\mathrm{CN}}^{-1},\mathrm{ }\mathrm{NO}\mathrm{ }\mathrm{and}\mathrm{ }\mathrm{CN}$

Which one of these will have the highest bond order?

HARD

Chemistry>Organic Chemistry>Basic Principles of Organic Chemistry>Theoretical Basis of Organic Reactions

Decreasing order of stability of ${\mathrm{O}}_2,\mathrm{ }{\mathrm{O}}_2^{-},\mathrm{ }{\mathrm{O}}_2^{+}$ and ${\mathrm{O}}_2^{2-}$ is: