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Toluene is a clear, and colorless liquid with an odor similar to benzene. Toluene is a naturally occurring chemical compound that becomes a vapor when exposed to air at room temperature. The chemical formula of toluene is C6H5CH3. Toluene is a mono-substituted colorless liquid that has a CH3 group attached to a phenyl group. Toluene is primarily derived from petroleum or petrochemical processes. It is a liquid compound that is insoluble in water and smells like paint thinners. Toluene vapor has a sharp or sweet odor that is a sign of exposure. There are several applications of Toluene such as it is present in gasoline, glues, and paints. Toluene is used in a mixture with other solvents and chemicals such as paint pigments.
Key Terms: Toluene, Hydrocarbons, Methylbenzene, Gasoline, Phenyl Group, Aromatic Hydrocarbon, Lewis Acid, Crude Oil, Benzene
What is Toluene?
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Toluene is an aromatic hydrocarbon that resembles benzene but is less volatile, flammable, and toxic.
- Toluene is a mono-substituted colorless liquid that has a CH3 group attached to a phenyl group.
- The systematic IUPAC name of toluene is methylbenzene.
- Toluene is a clear, colorless liquid that becomes a vapor when exposed to air at room temperature.
- It is flammable. i.e. its vapors can be ignited by flames, sparks, or other ignition sources.
- Toluene is widely used as an industrial raw material and as a solvent for the manufacturing of various commercial products, including paints and glues.
- It is used as an antiknock agent for gasoline.
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Structure of Toluene
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Toluene, also called methylbenzene, is a natural synthetic compound. It is an aromatic hydrocarbon that is composed of a benzene ring linked to one methyl group. The chemical formula of toluene is C6H5CH3. The structure of Toluene is given as follows:
Structure of Toluene
Properties of Toluene
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The properties of Toluene are as follows:
- Toluene is more reactive than benzene to electrophiles.
- Because of the greater part of the methyl group than the electron-releasing properties, toluene reacts with normal fragrant in the same position.
- Toluene goes through sulfonation and accordingly, it gives an acid called p-toluenesulfonic, and chlorination by Cl2 in the presence of FeCl3 to give ortho and para isomers of chlorotoluene.
A few other important properties of Toluene are listed below:
| Properties of Toluene | |
|---|---|
| Chemical Formula | C6H5CH3 |
| Molecular Weight of Toluene | 92.141 g/mol |
| Boiling Point of Toluene | 111°C |
| Toluene Melting Point | −95°C |
| Density of Toluene | 0.87 g/mL |
Preparation of Toluene
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Production of Toluene at the industrial level is quite inexpensive. Toluene can be synthesized through various methods which are as follows:
- Toluene is obtained as a by-product in gasoline production and in coke production from coal.
- It is also found naturally in crude oil.
- When benzene reacts with methyl chloride in the presence of aluminium chloride, also referred to as Lewis acid, toluene is obtained. The reaction for the same is:
| C6H5H + CH3Cl → C6H5CH3 + HCl |
Uses of Toluene
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There are numerous applications of Toluene. Some of the applications are listed below in detail:
Toluene as a Precursor to Benzene
The most important use of Toluene is as a precursor to benzene. Given below is the reaction between toluene and hydrogen gas.
C6H5CH3 + H2 → C6H6 + CH4
The second most used application of Toluene involves a disproportionation reaction with the mixture of benzene and xylene.
Toluene as a Precursor to Other Chemicals
Toluene is also used in the manufacturing of the following substances:
- Trinitrotoluene
- Polyurethane foam
- TNT
- Synthetic Drugs
Toluene as a Solvent
Toluene is implied as a common solvent for the given substances:
- Glues
- Rubber
- Leather Tanners
- Silicone Sealants
- Chemical Reactants
- Lacquers
- Disinfectants
- Paints
- Paint Thinners
- Printing Ink
Other Uses of Toluene
- Toluene is used as a solvent for nanotubes, carbon nanomaterials, and fullerenes.
- It can also be utilized in internal combustion engines such as gasoline fuel.
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Hydrocarbons Class 11 Handwritten Notes
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Given below are the handwritten notes on hydrocarbons and related concepts:
Things to Remember
- Toluene is a clear and colorless liquid with the chemical formula C6H5CH3.
- Toluene is a mono-substituted colorless liquid consisting of a CH3 group attached to a phenyl group.
- The compound is water-insoluble and smells like paint removers.
- Toluene is more reactive toward the electrophiles than benzene.
- Production of Toluene at the industrial level is quite economical.
- Benzene reacts with methyl chloride in the presence of aluminum chloride to give toluene.
- Toluene is used as a natural substance and a dissolvable for manufacturing numerous items including paints and pastes.
Previous Years’ Questions
- In Friedel-Craft's synthesis of toluene, the reactants… (NEET 2000)
- Which of the following reagents will be able to distinguish… (NEET 1980)
- In Friedal-Craft's alkylation besides… (NEET 1999)
- In preparation of alkene from alcohol using… (NEET 2001)
- In pyrrole, the electron density is maximum on… (NEET 2016)
- Liquid hydrocarbons can be converted to a mixture of gaseous… (NEET 2010)
- Which of the following alkane cannot be made in good yield… (NEET 2020)
- Which of the following compounds has the lowest boiling point… (NEET 1994)
- With respect to the conformers of ethane, which of the… (NEET 2017)
- Which one is the correct order of acidity… (NEET 2017)
Sample Questions
Ques. What is Toluene? (3 Marks)
Ans. Toluene is a substituted aromatic hydrocarbon which is a colorless, water-insoluble liquid in appearance. The smell of toluene can be associated with that of paint thinners. Toluene is a mono-substituted benzene derivative, consisting of a methyl group (CH3) attached to a phenyl group. The systematic IUPAC name of toluene is methylbenzene.
Ques. What is Toluene used for? (3 Marks)
Ans. Toluene has numerous applications in various parts of the industry.
- Toluene is used as a solvent in various consumer products and is utilized in paint removers, nail clean removers, pastes, and correction fluid.
- Toluene is used in a mixture with other solvents and chemicals such as paint pigments.
- Toluene is also there in Gasoline and other fuels.
Ques. Is Toluene soluble in water? Explain what happens when the combustion of toluene takes place. (3 Marks)
Ans. Toluene is not soluble in water at all. This compound is made up of carbon and hydrogen, and its polarity is very small. Combustion of Toluene involves the burning of toluene in the presence of oxygen. Toluene in the presence of oxygen burns with a smoky flame.
Ques. What does Toluene smell like? (3 Marks)
Ans. Toluene is a sweet-smelling hydrocarbon subsidiary of methyl-subbed benzene, which exists as a transparent, colorless volatile liquid. It has a pungent, benzene-like odor. Though toluene is insoluble in water, it may be miscible with other organic solvents.
Ques. What functional group is Toluene? (3 Marks)
Ans. Toluene is the least difficult toluene member of the class consisting of a benzene core containing a single methyl substituent. Also, Toluene is a part of toluenes and methylbenzene, a volatile organic compound.
Ques. How many sigma bonds are there in Toluene? (2 Marks)
Ans. The benzene ring contains 12 sigma bonds and 3 pi bonds, and the substituent bunch, methyl, has 3 sigma bonds. In this manner, toluene (C6H5CH3) has 15 sigma bonds and 3 pi bonds.
Ques. How is Toluene commercially prepared? How is trinitrotoluene (TNT) prepared from toluene? (3 Marks)
Ans. Toluene is commercially prepared from the light oil part of coal tar and in huge amounts, it is acquired from reactant dehydrogenation of oil-based goods. TNT is prepared from toluene by nitration. On mononitration, nitrotoluene is framed and on additional nitration dinitrotoluene and dynamite are formed.
Ques. How to distinguish between Benzene and Toluene? (2 Marks)
Ans. Toluene is oxidized to benzaldehyde by using chromyl chloride and benzoic acid using hot concentrated Potassium permanganate. Benzene is stable, it does not undergo oxidation reactions easily.
Ques. How is toluene produced? (3 Marks)
Ans. Toluene is found in crude oil naturally and is a by-product of gasoline production and coke production from coal.
Producing Toluene at the industrial level is quite economical. The reaction of benzene with methyl chloride in the presence of aluminum chloride (Lewis acid) gives toluene, for which the reaction is as follows:
C6H5H + CH3Cl → C6H5CH3 + HCl
Ques. Is toluene very toxic? (1 Mark)
Ans. Toluene is an irritating component to the skin, eyes, and respiratory tract. Exposure to toluene can cause systemic toxicity by ingestion or inhalation and is slowly absorbed through the skin.
Ques. Is toluene miscible? (2 Marks)
Ans. Toluene is a miscible compound with ethanol, benzene, diethyl ether, acetone, chloroform, glacial acetic acid, and carbon disulfide. It means it is soluble in all proportions in these compounds, However, toluene is immiscible with water.
Ques. Is toluene harmful to humans? (2 Marks)
Ans. Yes, exposure to toluene can cause eye and nose irritation, tiredness, confusion, dilated pupils, tears, anxiety, euphoria, dizziness, headache, muscle fatigue, insomnia, nerve damage, inflammation of the skin, and liver and kidney damage. The symptoms worsen as exposure increases, and long-term exposure may lead to other prolonged damages.
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