what are the importance of alkenes?
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alkenes like ethene,propene undergo addition reactions at high temperatures and pressures to form addition polymers like polythene,PVC etc.\nalkenes like ethene are used in artificial ripening of fruits.
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Organometallics are very important in pharmaceuticals.\nThey can be used to make synthetic haemoglobin which is used to transport oxygen around in the blood stream.
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I don't know which is important to you?\n\nAcid anhydrides \nAcyl halides \nAlcohols \nAldehydes \nAlkanes \nAlkenes \nAmides \nAmines \nAromatics \nAzo compounds \nCarboxylic acids \nEsters \nEthers \nHaloalkanes \nImines \nKetones \nNitriles \nNitro compounds \nOrganometallics \nPhenols \nPolymers
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Chemistry is a subject of memory and conception. One requires knowledge of mathematics and physics to tackle physical chemistry.Inorganic Chemistry requires memory, reasoning capabilities and logical skills.Organic Chemistry require good knowledge of almost the whole of Physical and Inorganic if you go to learn mechanisms and far deep.Good Conceptual study can reduce a lot of labour and time wasted in studying like a parrot. Practicals should accompany theory as it helps in good understanding.
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Of the choices you listed above, then Alkane is the answer.  There are other compounds which fit this description, for example the cycloalkanes which is a sub-group of alkanes.\n\nThese are also called aliphatic compounds and saturated hydrocarbons.
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http://en.wikipedia.org/wiki/Organic_chemistry
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These chemicals have one thing in common, carbon atoms. Carbon atoms link in chains, like C-C-C. Carbon atoms "like" to have 4 bonds with other atoms. In each of the chemicals you named, the carbons are all single or double-bonded to other carbons; the other bonds are with hydrogen atoms.\n\nThese are the simplest "organic chemicals". It used to be thought that "organic" chemicals were produced by living things. Now they're known to be produced in outer space as well. So there are many possible "origins" for these molecules in that sense.\n\nMethane molecules have only one carbon atom; octane has 8. So you might say that all of these molecules have their origin in carbon atoms sharing bonds with other carbons.
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A hydrocarbon where some of the hydrogens have been replaced with alkyl side-chains or other elements (e.g. halogens, oxygen-containing, or nitrogen-containing groups)
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typical gasoline consists of hydrocarbons with between 5 and 12 carbon atoms per molecule
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Lipids are a class of hydrocarbon-containing organic compounds essential for the structure and function of living cells. Lipids are characterized by being water-insoluble and soluble in nonpolar organic solvents such as ether. Usually they are aliphatic but they can have rings in their structure. Although the word lipid is commonly used as a synonym to fat, the latter is a subgroup of triglyceride lipids.
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The most important concept of organic chemistry is "the interaction of filled and empty orbitals is stabilising!" Keep that in mind and you will be fine.
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The initial dehydration (probably via E2 mechanism with water acting as base) forms 3-methyl-1-pentene.\n\nThat alkene is protonated by the acid present in solution (required to perform dehydration) to form a secondary carbocation.  That cation can deprotonate back to the starting alkene or to the 3-methyl-2-pentene.  The equilibrium favors the more highly substituted alkene (3-methyl-2-pentene has three alkyl groups on the double-bonded carbons).
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Mostly because of its sp3 hybridization - that is, the fact that 4 atoms or molecules can bond with great stability to the carbon atom. For example, methane (CH4) is the simplest of the carbon compounds. But now, replace any of those H's with almost any other kind of molecule and you get the meat & potatoes of what organic chemistry is all about.
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wat r u ppl talking about....u ppl r absolutely wrong.....its alkynes n i am 100% sure about\n\nthey r more reactive becoz of there triple bonds...\n\n\n2 ppl in a row a row giving a wrong answer can confuse a person completely
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Any of the heavy metals, or benzene products would be excellent topics. If you attempt to present a case on a chemical that's too obscure you'll have a difficult time finding enough research/clinical trials to support your claim. Peruse the EPA website to get some other ideas.
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Alkanes-such as methane (CH4) can pass through the lipid bilayer.
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CnHnx2\n\nFor instance, the simplest alkene is ethene, or C2H4.