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NEET UG 2026 » NEET UG Study Material » Chemistry » Hydrocarbons
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Hydrocarbons

According to organic chemistry, a hydrocarbon is an organic substance that is wholly composed of the elements hydrogen and carbon. Hydrocarbons are a type of hydride that belongs to group 14.

Table of Content
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These compounds have the chemical formula CxHy, which stands for CxHy. 

Hydrocarbons can be found in both plants and trees, indicating their presence. 

Carotenes, for example, are an organic pigment that can be found in green leafy vegetables and carrots. In natural crude rubber, these hydrocarbons account for up to 98 percent of the total. 

Furthermore, they have a significant amount of internal energy, which contributes to their significance.

Older chemists classed hydrocarbons as either aliphatic or aromatic, depending on their chemical structure. 

The classification was done on the basis of their origin and physical characteristics. 

Thus, it was discovered that aliphatic hydrocarbons were derived from the chemical degradation of fats or oils, whereas aromatic hydrocarbons contained substances that were a result of the chemical degradation of certain plant extracts. 

Aliphatic hydrocarbons were found to be more environmentally friendly than aromatic hydrocarbons.

 We now classify hydrocarbons based on their structure rather than their origin, which is a more accurate classification.

Classification of Hydrocarbons

Saturated hydrocarbons are molecules in which carbon-carbon atoms and carbon-hydrogen atoms are bound together by single bonds, as opposed to unsaturated hydrocarbons. 

These single-bonded hydrocarbons are the most basic of all the hydrocarbons. 

Double and triple bonds are absent from the structure of these types of hydrocarbons. 

In terms of hybridization, they have Sp3 hybridised carbon atoms, but no Sp2 or Sp hybridised carbon atoms are found in their structure. 

They are collectively referred to as alkanes, and their usual formula is CnH2n+2. 

For example, CH4C3H6 is a chemical compound.

The term “unsaturated hydrocarbon” refers to substances that contain a single, double, or triple bond between carbon and carbon atoms.

 Alkenes are double-bonded compounds, whereas alkynes are triple-bonded compounds, and the double-bonded compounds are referred to as alkenes. 

When describing alkenes, the usual formula is CnH2n, and when describing alkynes, the general formula is CnH2n-2.

  • Cycloalkanes: These hydrocarbons include one or more carbon rings and are classified as aromatic hydrocarbons. 

The hydrogen atom is joined to the carbon ring by a covalent bond.

  • Aromatic hydrocarbons, commonly known as arenes, are a type of hydrocarbon.

 Arenes are chemicals that have at least one aromatic ring in their structure.

  • Aliphatic hydrocarbons are characterised by having straight chain architectures with no rings present.

These hydrocarbons have a ring structure in them, which makes them alicyclic hydrocarbons. The carbon atoms can be hybridised in one of three ways: Sp1, Sp2, or Sp3.

The Characteristics of Hydrocarbons

In addition to having distinct molecular structures, the empirical formulas of hydrocarbons are also distinctively diverse from one another.

For example, in alkanes, alkynes, and alkenes, the amount of bound hydrogen drops, whereas in alkenes and alkynes, the amount of bonded hydrogen increases. 

Because of the “self-bonding” or catenation of carbon, which prevents the hydrocarbon from becoming completely saturated by forming double or triple bonds, this is primarily the cause of the problem.

 Catenation is a term used to describe the ability of hydrocarbons to form bonds with one another. 

Due to these properties, they are able to produce more complex compounds such as cyclohexane as well as aromatic hydrocarbons such as benzene in very rare situations.

Additionally, hydrogenation (also known as cracking of hydrocarbons) is a process in which large, heavy organic molecules are broken down into smaller, lighter molecules. 

This is performed with the application of sufficient heat and pressure. In order to accelerate the process, catalysts are sometimes used. 

When it comes to the commercial manufacture of diesel fuel and gasoline, this technique is critical to their success.

What are hydrocarbons and how do they work?

Hydrocarbons are organic compounds that are totally composed of only two types of atoms – carbon and hydrogen – and have no other constituents.

 Hydrocarbons are colourless gases with extremely faint odours that are typically found in natural gas. 

Hydrocarbons can have simple or relatively complex structures, and they can be divided into four subcategories: alkanes, alkenes, alkynes, and aromatic hydrocarbons.

 Alkanes are the most common type of hydrocarbon, while alkenes are the most common type of alkene. 

Understanding the chemical properties of hydrocarbons can help us understand the chemical properties of other functional groups and how they are prepared. 

Furthermore, Liquefied Petroleum Gas (LPG) is produced from hydrocarbons such as propane and butane, which is used as a commercial fuel (LPG). 

Benzene, one of the most basic aromatic hydrocarbons, is used as a starting material in the production of a wide variety of synthetic pharmaceuticals. 

What is the difference between Saturated and Unsaturated Hydrocarbons?

  • Definition–

Saturated Hydrocarbons: Saturated hydrocarbons are hydrocarbons that have only a single covalent link with the surrounding environment.

Unsaturated Hydrocarbons: Unsaturated hydrocarbons are hydrocarbons that have a large number of covalent bonds (double and triple bonds).

  • Types–

Saturated hydrocarbons include alkanes, which are hydrocarbons that have been saturated.

Unsaturated hydrocarbons include alkenes, alkynes, and aromatic hydrocarbons, all of which are forms of hydrocarbons that are not saturated.

  • Reactivity

Saturated Hydrocarbons: Saturated hydrocarbons are less reactive than unsaturated hydrocarbons.

Unsaturated Hydrocarbons: Unsaturated hydrocarbons are more reactive than saturated hydrocarbons are.

Burning in the open air

Fires created by the combustion of saturated hydrocarbons produce a blue flame that is free of soot and ash.

Hydrocarbons that are not saturated with hydrogen produce a yellow, sooty flame when they are burned.

Saturated Hydrocarbons: Saturated hydrocarbons are hydrocarbons that include a little quantity of carbon and a significant amount of hydrogen.

The term “unsaturated hydrocarbon” refers to hydrocarbons with a high concentration of carbon and a low concentration of hydrogen.

The distinction between saturated and unsaturated hydrocarbons is determined by the types of bonds that each molecule has. 

Only single covalent bonds may be found in saturated hydrocarbons, whereas unsaturated hydrocarbons have at least one double or triple carbon-carbon link, and in certain cases more than one.

 As a result, unsaturated hydrocarbons have a higher reactivity than saturated hydrocarbons Saturated hydrocarbons include alkanes, whereas unsaturated hydrocarbons include alkenes, alkynes, and aromatic hydrocarbons. 

Saturated hydrocarbons are those that are saturated with hydrogen. 

Conclusion

Hydrocarbons are often colourless and hydrophobic, having just a faint odour to distinguish them from other substances.

 It is impossible to make broad generalisations about their molecular architectures because they are so different.

 When it comes to the oil and gas industry, hydrocarbon is a broad term that encompasses both petroleum and natural gas, which are the two naturally occurring phases of hydrocarbons that have been commoditized by the industry.

 The burning of fossil fuels, including the production and combustion of fuel, accounts for the vast majority of anthropogenic greenhouse gas emissions. 

Vegetation emits hydrocarbons such as methane, ethylene, isoprene, and monoterpenes, which are natural sources of hydrocarbons.

faq

Frequently asked questions

Get answers to the most common queries related to the NEET UG Examination Preparation.

What are hydrocarbons and how do they differ from one another?

Ans) Any of the organic compounds belonging to the hydrocarbon class that inc...Read full

What is the process through which hydrocarbons are formed?

Ans) In the Earth’s crust, a region that extends five to ten miles belo...Read full

Describe the features of hydrocarbons.

Ans) Hydrocarbons have no colour and emit no odour when burned.  ...Read full

What is a saturated hydrocarbon?

Ans) A Saturated hydrocarbon is a hydrocarbon in which all of the carbon-carb...Read full

Giive an example of an unsaturated hydrocarbon?

Ans) Unsaturated hydrocarbons such as ethene are examples of such compounds.Â...Read full

Ans) Any of the organic compounds belonging to the hydrocarbon class that include simply the atoms carbon (C) and hydrogen (H) are classified as hydrocarbons (H). 

 

The carbon atoms bind together to form the framework of the compound, and the hydrogen atoms attach to them in a variety of ways to build the compound’s chemical structure an inorganic chemical compound

Ans) In the Earth’s crust, a region that extends five to ten miles below the Earth’s surface, geologists and geochemists believe that nearly all hydrocarbons in commercially produced crude oil and natural gas are formed by the decomposition of the remains of living organisms that have been buried under layers of sediment for five to ten million years.

Ans) Hydrocarbons have no colour and emit no odour when burned. 

As the number of carbon atoms in a hydrocarbon grows, the boiling point of the hydrocarbon rises dramatically.

 When hydrocarbons are exposed to oxygen, they undergo a combustion reaction that results in the creation of CO2 and water. 

Alkanes are the least reactive hydrocarbons when compared to the other types of hydrocarbons.

Ans) A Saturated hydrocarbon is a hydrocarbon in which all of the carbon-carbon linkages are single bonds, as opposed to unsaturated hydrocarbons. 

An organic substance with only two constituents, carbon and hydrogen, that is referred to as a hydrocarbon.

Ans) Unsaturated hydrocarbons such as ethene are examples of such compounds. 

Other examples of unsaturated molecules include benzene and acetic acid, both of which are organic compounds.

All bond angles involving the carbon-carbon double bond are 120 degrees in angle. 

All of the atoms that are bonded to the double-bonded carbon atoms are located in the same plane as one another.

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