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Difference Between Isopentane and Neopentane

September 24, 2018Posted byMadhu

Thekey differencebetween isopentane and neopentane is that theisopentane contains a four-membered carbon chain with onemethylgroup attached to this chain at the second carbon atom of the chain whereas the neopentane contains one carbon centre attached with four methyl groups.

Isopentane and neopentane arestructural isomersof each other. Therefore, both these compounds have the same chemical formula; C5H12. However, due to the difference between isopentane and neopentane in their chemical structures, they have different chemical and physical properties. Another notable difference between isopentane and neopentane is that isopentane exists as a colourless liquid while neopentane is a colourless gas at standard temperature and pressure.

CONTENTS

1.Overview and Key Difference
2.What is Isopentane
3.什么是新戊烷
4.Side by Side Comparison – Isopentane vs Neopentane in Tabular Form
5.Summary

What is Isopentane?

Isopentane is an organic compound having the chemical formula C5H12and exists as a colourless liquid at standard temperature and pressure. TheIUPAC nameof this compound is 2-Methylbutane. Moreover, it is a branchedalkanehaving a four-membered carbon chain with one methyl group attached to this chain, at the second carbon atom of the chain. Thus, it is an extremely volatile and flammable liquid.

Difference Between Isopentane and Neopentane

Figure 01: Chemical Structure of Isopentane

More importantly, it is the least dense liquid at standard temperature and pressure. Therefore, the boiling point is just a few degrees above the normal room temperature. Hence it readily boils to form its vapour. The molar mass of this compound is 72.15 g/mol. The melting point and boiling points are within the range of −161 to −159 °C and 27.8 to 28.2 °C respectively.

什么是新戊烷?

Neopentane is an organic compound having the chemical formula C5H12and exists as a colourless gas at standard temperature and pressure. It is a structural isomer of pentane. It is a double branched alkane which has one carbon centre attached to four methyl groups. The double branch occurs at the middle carbon atom of a three-membered carbon chain.

Key Difference Between Isopentane and Neopentane

Figure 02: Chemical Structure of Neopentane

The IUPAC name of this compound is hence 2,2-Dimethylpropane. Therefore, this molecule has a tetrahedral geometry. Moreover, it exists as a flammable gas at room temperature and pressure. As a result, it can condense into a highly volatile liquid on a cold day, if we put it in an ice bath or if we compress it applying suitable pressure. The melting point and boiling points are −16.5 °C and 9.5 °C respectively.

What is the Difference Between Isopentane and Neopentane?

Isopentane is an organic compound having the chemical formula C5H12and exists as a colourless liquid at standard temperature and pressure whereas neopentane is an organic compound having the chemical formula C5H12and exists as a colourless gas at standard temperature and pressure. Here, we have to note that though they have the same chemical formula; C5H12,they have different chemical structures. That is because they are structural isomers of each other. The isopentane contains a four-membered carbon chain with one methyl group attached to this chain at the second carbon atom of the chain whereas the neopentane contains one carbon centre attached with four methyl groups. Hence, this is the key difference between isopentane and neopentane.

另外,因为在他们的化学的区别structures, we can identify some difference between isopentane and neopentane in their chemical properties too. Moreover, they both exist in different physical states as well. Isopentane exists as a colourless liquid while neopentane is a colourless gas at standard temperature and pressure. Therefore, this is another significant difference between isopentane and neopentane.

Difference Between Isopentane and Neopentane in Tabular Form

Summary – Isopentane vs Neopentane

异戊烷和新戊烷tructural isomers of each other. Therefore they have the same chemical formula but different chemical structures. The key difference between isopentane and neopentane is that isopentane contains a four-membered carbon chain with one methyl group attached to this chain at the second carbon atom of the chain whereas neopentane contains one carbon centre attached with four methyl groups.

Reference:

1. “Isopentane.” Wikipedia, Wikimedia Foundation, 13 Aug. 2018.Available here
2. “Neopentane.” Wikipedia, Wikimedia Foundation, 4 June 2018.Available here

Image Courtesy:

1.”Isopentane”By No machine-readable author provided. (Public Domain) viaCommons Wikimedia
2.”Neopentane”By No machine-readable author provided. No machine-readable author provided. (Public Domain) viaCommons Wikimedia

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Filed Under:Organic Chemistry

About the Author:Madhu

Madhu is a graduate in Biological Sciences with BSc (Honours) Degree and currently persuing a Masters Degree in Industrial and Environmental Chemistry. With a mind rooted firmly to basic principals of chemistry and passion for ever evolving field of industrial chemistry, she is keenly interested to be a true companion for those who seek knowledge in the subject of chemistry.

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