Organic Chemistry: Alkanes

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bristy1588
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Organic Chemistry: Alkanes

Unread post by bristy1588 » Sun Dec 18, 2011 7:52 pm

What is the reason behind the irregularity of the melting point of the alkanes??
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Re: Organic Chemistry: Alkanes

Unread post by nafistiham » Sun Dec 18, 2011 8:19 pm

the bigger the molecule is the more are bonds.and, we need more heat to break them.that's why
\[\sum_{k=0}^{n-1}e^{\frac{2 \pi i k}{n}}=0\]
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bristy1588
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Re: Organic Chemistry: Alkanes

Unread post by bristy1588 » Sun Dec 18, 2011 8:40 pm

U see, melting point increases from c-1 to c-2 and again drops from c-2 to c-3. then again increases then decreases. here c-2 denotes the Alkane with 2 carbon atoms. I was asking for the reason that will explain this irregularity
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Re: Organic Chemistry: Alkanes

Unread post by *Mahi* » Sun Dec 18, 2011 9:53 pm

Ethane, propane and n-butane form layer structures in the solid state. By describing their molecular geometries as a rectangle, an irregular pentagon and an irregular hexagon, respectively, it is shown here that propane cannot close-pack like its congeners. The melting point of propane is therefore lower than expected in the series.
http://pubs.rsc.org/en/Content/ArticleL ... J/b004283h
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bristy1588
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Re: Organic Chemistry: Alkanes

Unread post by bristy1588 » Sun Dec 18, 2011 9:57 pm

Thanx Mahi,
U have saved me some time,:D
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Re: Organic Chemistry: Alkanes

Unread post by raihan khan » Thu Jan 05, 2012 5:22 am

as my chemistry teacher said one who is proficient in organic chemistry he knows stereo chemistry very well. and i think that is nothing but physics s o all the proper explanation lies in physics

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