Question:

In acetylene molecule, between the carbon atoms there are

Updated On: Apr 2, 2024

three sigma bonds
two sigma and one pi bonds
one sigma and two pi bonds
three pi bonds

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The Correct Option is C

Solution and Explanation

The structure of acetylene is $ {H - C $ \overset{{1 \sigma}}{ {\equiv }} \underset{{ 2 \pi}}{ { \equiv }}$ 1 \sigma 2\pi C - H }$ Hence, in acetylene molecule, there are one sigma and two pi bonds are present between carbon atoms.

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Concepts Used:

Organic Chemistry – Some Basic Principles and Techniques - Reaction Mechanism

SN1 Reaction Mechanism:

S_N¹ reaction mechanism takes place by following three steps –

Formation of carbocation
Attack of nucleophile
Deprotonation

SN2 Reaction Mechanism:

The SN2 reaction mechanism involves the nucleophilic substitution reaction of the leaving group (which generally consists of halide groups or other electron-withdrawing groups) with a nucleophile in a given organic compound.

Electrophilic Aromatic Substitution Reaction Mechanism:

The mechanism of an electrophilic aromatic substitution reaction contains three main components which are:

A new sigma bond from C=C is formed during the reaction in the arene nucleophile.
Due to the breaking of the C-H sigma bond, a proton is removed.
The C=C bond is reformed and it restores the aromaticity of the compound.

Electrophilic Substitution Reaction Mechanism:

The electrophilic substitution reaction mechanism is composed of three steps, which will be discussed more below.

Electrophile Generation
Carbocation Formation
Proton Removal