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Organic Chemistry

Blazing goIITian

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11 Mar 2010 21:06:40 IST

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what is the exact definition of alkynes?

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what is the exact definition of alkynes?

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snehil PRAKASH

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11 Mar 2010 21:08:56 IST

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none of the exam ask this...............defination mug up karnay say kuch nai hoga............matlab samajho dost

snehil PRAKASH

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11 Mar 2010 21:09:01 IST

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any of a group of aliphatic hydrocarbons whose molecules contain one or more carbon-carbon triple bonds (see chemical bond). Alkynes with one triple bond have the general formula CnH2n−2. In the International Union of Pure and Applied Chemistry (IUPAC) system of chemical nomenclature, the name of an alkyne is derived from the name of the corresponding alkane by replacing the -ane alkane suffix with -yne and, if necessary, adding a prefix to indicate the location of the triple bond in the molecule. The IUPAC name of the simplest alkyne, HC-CH, is thus ethyne, which is derived from ethane. Ethyne is more commonly known as acetylene; it is an extremely important starting material in commercial chemical synthesis. The next simplest alkyne is propyne, CH3C-CH. There are two butynes, 1-butyne and 2-butyne, which are structural isomers that differ in the location of the triple bond in their molecule. The alkynes are sometimes referred to as the acetylene series, the higher members of the series being named as derivatives of acetylene, e.g., propyne as methylacetylene, 1-butyne as ethylacetylene, and 2-butyne as dimethylacetylene. The usefulness of the alkynes in chemical synthesis is due both to the reactions of the triple bond itself and to the relative acidity of a hydrogen atom bonded to a triply bonded carbon.

ThIrStY of IIT

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11 Mar 2010 21:15:34 IST

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if one compound contain one double bond and one triple bond then what is the name of the compound?

Madhusudan Chavan

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14 Mar 2010 12:14:33 IST

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Acyclic unsaturated hydrocarbons containing a triple bond are called Alkynes or Acetylene, there general formula is C_nH_2n-2, where n= 2,3,4,etc.

If both the double and triple bonds are present, such compounds are named as derrivatives of alkynes rather than alkenes, and while writing their names, the terminal 'e' from suffix 'ene' is dropped. The numbering of the parent chain in such compounds is done from that direction which is nearer to the double or triple bond, i.e., lowest locant rule for multiple bonds is followed. If however, there is a choice in numbering, the double bond is always given preference over the triple bond.

CH₃-CH=CH-CΞCH Pent-3-en-1-yne

HCΞC-CH₂-CH=CH₂ Pent-1-en-4-yne

HCΞC-CH=CH-CH=CH₂ Hexa-1,3-dien-5-yne

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