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![[Post New]](/templates/default/images/icon_minipost_new.gif) 28 Dec 2007 10:30:49 IST
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Guys , I have this real big confusion abt the following nomenclature terms, what do you mean by, NEO ISO TERT SEC Carbons compounds PLS GIVE THE BASIC IDEA . 5 POINTER ASSURED
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28 Dec 2007 11:00:50 IST
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iso-1 methyl group attached to 2nd carbon atom of parent chain
neo-2 methyl groups attached to 2nd carbon atom of parent chain
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"I a universe of atoms.......an atom in the universe" |
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28 Dec 2007 11:02:32 IST
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tert refers to tertiary carbon.
sec refers to secondary carbon
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"I a universe of atoms.......an atom in the universe" |
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28 Dec 2007 11:03:44 IST
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let me give u a simple example.
consider a hydrocarbon with four carbons, C4H10. This molecule can be represented as a straight-chain
(common name: n-butane, IUPAC* name: butane)
or as a branched molecule
or CH3-CH-(CH3)2
(common name: isobutane, IUPAC name: 2-methylpropane or just methylpropane; the 2 is redundant since there is no other place for a branch to go.)
These molecules both have the same chemical formula but are obviously different in their connectivity (structure). They are structural isomers of each other.
If we consider a five-carbon alkane, we can have three different isomers.
CH3-CH2-CH2-CH2-CH3 ====> n-pentane
CH3-CH2-CH-CH3 ====> iso-pentane alias 2-methylbutane
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CH3
CH3
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CH3- C - CH3 ====> neo-pentane or 2,2-dimethylpropane
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CH3
These three molecules are all structural isomers of each other, i.e., they all have the formula C5H12 but they have different connectivities (structures).
note that n is not same as neo
tertiary indicates 3 degree carbon and secondary 2 degree carbon
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28 Dec 2007 11:08:39 IST
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The alkanes having a straight or normal chain are called normal or n- hydrocarbons. The alkanes in which the carbon chain has branches are called branched chain hydrocarbons. Such alkanes as possess a one-carbon branch on the 2nd carbon of the normal basic chain, are called Iso hydrocarbons. When the normal carbon chainpresent in the molecule has 2 one-carbon branches on the 2nd carbon from the end, the alkane is referred to as Neo hydrocarbon. Secondary or 2degree carbon atom is the one which is bonded to 2 other carbon atoms. Tertiary or 3 degree carbon atom is the one which is bonded to 3 other carbon atoms.
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PROGRESS ISN'T MADE BY EARLY RISERS OR HARD WORKERS, BUT BY LAZY PEOPLE TRYING TO FIND EASIER WAY TO DO THE SAME.....SO BE LAZZZZYY!!!! |
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28 Dec 2007 11:36:10 IST
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i think the stru formula 4 neo is CH3 / 3HC -C-CH2-R (where R Is any grp) / CH3 plz correct me if m rong...
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28 Dec 2007 11:39:54 IST
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no u're wrong bcoz if R is any functional grp containing Carbon then 1st priority will be given to it... and the name will completely change.
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PROGRESS ISN'T MADE BY EARLY RISERS OR HARD WORKERS, BUT BY LAZY PEOPLE TRYING TO FIND EASIER WAY TO DO THE SAME.....SO BE LAZZZZYY!!!! |
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28 Dec 2007 22:22:49 IST
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iso has a methyl group attached to 2nd carbon
neo has 2 methyl groups attached to 2nd carbon
tert is the name given to a compound having functional group at tertiary carbon and similarly for sec
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