MS Chauhan Chapter 4A Hydrocarbons (Alkanes)

MS Chauhan Organic Chemistry Solutions Chapter 4A develops a clear approach to hydrocarbon – alkanes and its properties. The main topics of the chapter of MS Chauhan Organic Chemistry Solutions include hydrocarbon – alkanes, its properties, preparation of alkanes from alkenes, alkynes, and alkyl halides.

These solutions prepared by Instasolv are meant for providing in-depth learning. In these MS Chauhan Hydrocarbons (Alkanes) Solutions, you will be introduced to a lot of important concepts of hydrocarbons. This will be really helpful for those who wish to continue to study Chemistry as a subject in further classes. Also, referring to these MS Chauhan Solutions will help you in preparing for the competitive exams like JEE and NEET with ease.

MS Chauhan Organic Chemistry Solutions for Chapter 4A Hydrocarbons (Alkanes) has a total of 63 questions. There are different types of questions available for practice including very short answer type questions, match the following, multiple-choice questions, and subjective type questions. A complete explanation of each question is given in the solutions and they are written in the simplest language so that you can understand the same with ease. You can follow MS Chauhan Solutions provided by Instasolv from anywhere and at any time for free.

Important Topics for MS Chauhan Organic Chemistry Solutions Chapter 4A – Hydrocarbons (Alkanes)


Hydrocarbons are the organic compounds collected from elements like carbon and hydrogen only. The study of hydrocarbons provides a vision into the chemical properties of other functional groups and their preparations.

We use hydrocarbons including propane and butane for the use of our commercial fuel in the form of LPG cylinders. For many of the synthetic drugs developed, benzene is the initial material.


In organic chemistry, an alkane refers to an acyclic saturated hydrocarbon. In other words, an alkane comprises hydrogen and carbon atoms organized in a tree structure in which all the carbon-carbon bonds are single. They have the general chemical formula and are represented as CnH2n+2.

Preparation of Hydrocarbons – Alkanes

The hydrocarbons-alkanes are prepared in the following ways:

From alkenes and alkynes

The alkanes can be created from alkenes or alkynes through the process of hydrogenation. H2 gas is delivered over a metal surface such as Ni, Pt along with the alkenes to generate alkane.

CH2=CH2 → (+Hz/Ni) CH3-CH3

The reaction provided above is known as the “Sabatier-Sender son’s” reaction. Other catalysts that can be used in this reaction are Pt, Pd-BaSo4, Wilkinson catalyst (R3PRhCl), or Adams catalyst (Pt2O), etc.

From Alkyl Halides

Alkyl halides can be transformed into alkanes through different methods. They are listed as follow:

  1. Using Zn/Parotic solvents
  2. Using courts reactions

Note: Alkanes with only an even number of carbon atoms can be produced.

  1. Using Reducing Agents:

R-X → [H]R – H

The reducing agents which can be used in this reaction include LiAlH4, NaNH2, NaBH4, etc.


  • LiAlH4 can’t decrease 3° halides.
  • NaBH4 can’t decrease 1° halide.
  1. From Aldehydes/Ketones:

Clemmensen’s Reduction: The Clemmensen reduction refers to a reaction that is used to decrease aldehydes or ketones to alkanes using hydrochloric acid and zinc amalgam. This type of reduction is named after a Danish chemist, Erik Christian Clemmensen.

Wolff-Kishner Reduction: Wolff Kishner reduction mechanism initiates with the creation of a hydrazone anion which then discharges the nitrogen atom to produce a carbanion. This carbanion then responds with the water in the system to give a hydrocarbon. Naturally, diethylene glycol is used as a solvent for this technique.

From Carboxylic acids through Decarboxylation:

Kolbe’s Electrolysis: Kolbe’s reaction is also called a Kolbe Schmitt Reaction. When phenol is combined with sodium hydroxide, phenoxide ion is produced. The phenoxide ion produced is more reactive as compared to phenol towards electrophilic aromatic substitution reaction. Therefore, it experiences an electrophilic substitution reaction with carbon dioxide, which is a feeble electrophile. Ortho-hydroxybenzoic acid is generated as the primary product. This reaction is commonly termed as Kolbe’s reaction.

Exercise-wise Discussion for MS Chauhan Organic Chemistry Solutions Chapter 4A – Hydrocarbons (Alkanes)

MS Chauhan Organic Chemistry Hydrocarbons (Alkanes) Solutions consists of two levels that are briefly explained below:

Level 1: This exercise set consists of a total of 50 questions based on the important concepts of the chapter. These are objective type questions which are considered important for the preparation of NEET or IIT JEE exams. Solving the questions of this exercise will help you understand how clear your concepts are.

Level 2: This exercise set consists of a total of 13 very short answer type questions containing match the following. In these questions, you have to match the option of Column I with that of the correct options of Column II. These solutions are systematically arranged for your quick learning and will help you save your time.

Why Use MS Chauhan Organic Chemistry Solutions Chapter 4A – Hydrocarbons (Alkanes) by Instasolv?

  • The MS Chauhan Solutions provided by Instasolv can be practised offline when you follow it once.
  • It mostly eradicates the need for any tuition or additional help from teachers as all the questions are explained well.
  • You can easily access these solutions online and start your preparation for the competitive exams like NEET and IIT JEE with ease.
  • Practising these MS Chauhan Organic Chemistry Chapter 4 Solutions will help you prepare for the exams well.
  • These solutions provide you with an idea about different types of questions asked in the CBSE and entrance exams and how to solve them.