Nomenclature of Alkyl Halides

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1. ORIENT COLLEGES TALAGANG
Second Year Chemistry
On-Screen Lectures
Chapter # 8
Lecture # 6

2. OrientColleges Orient193
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Commonortrivialnameofanalkylhalideisobtained
byaddingnameofalkylgrouppresentfollowedbythe
nameofhalogenashalidei.e.theirnamesarealkyl
halides
CH
3-Cl CH
3-CH
2-Br CH
3-CH
2-CH
2-I
MethylChlorideEthylBromide n-propyliodide
Common or Trivial Names of Alkyl Halides
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2020

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1.SelectthelongestC-chaincontainingthecarbonatomtowhich–X
groupisattachedwhere–Xishalogenatom.Thisiscalledparent
chain.Allgroupsoutsidethischainarecalledsubstituents
2.NumbertheC-atomsofchain.Forthispurposestartnumbering
fromtheendfromwherehalogengroupisnear
3.Namethesubstituentsinalphabeticalorderprefixedbytheir
position.e.g.5-ethyl
4.Ifasubstituentoccursmorethanonetime,useprefixesdi,tri,tetra
etc.toindicatetwo,three,fourormanytimesoccurrence.e.g.2,3-
dimethylor4,4-diethyl
5.NamethechainasALKANEcorrespondingtonumberofC-
atomsintheparentchain(asyouhavebeendoingfor
nomenclatureofalkanes)
IUPAC Names of Alkyl Halides
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July
2020

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IUPAC Names of Alkyl Halides
2-chloro-3-methylpentane
1.There are five Cs in the chain, so chain will be called pentane
2.-Cl is at C-2
3.There is methyl at C-3 so write 3-methyl
4.So full name is 2-chloro-3-methylpentane
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July
2020

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IUPAC Names of Alkyl Halides
3-chloro-4-ethyl-5-methylhexane
1.There are six Cs in the chain, so chain will be called hexane
2.-Cl is at C-3
3.There is methyl at C-5 and ethyl at C-4 so write 4-ethyl-4-methyl
4.So full name is 3-chloro-4-ethyl-5-methylhexane
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July
2020

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IUPAC Names of Alkyl Halides
3-bromo-3-ethylpentane
1.There are five Cs in the chain, so chain will be called pentane
2.-Br is at C-3
3.There is ethyl at C-3 so write 3-ethyl
4.So full name is 3-bromo-3-ethylpentane
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July
2020

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IUPAC Names of Alkyl Halides
2-iodo-2-methylbutane
1.There are four Cs in the chain, so chain will be called butane
2.Iodois nearer from left side, so start numbering from left side
3.There is methyat C-2 so write 2-methyl
4.So full name is 2-iodo-2-methylbutane
03
July
2020

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IUPAC Names of Alkyl Halides
3-chloro-5,6-diethyl-4-methyloctane
1.There are eight Cs in the chain, so chain will be called octane
2.Chloro is nearer from right side, so start numbering from right side
3.-Cl is at C-3
4.There is methyl at C-4 and two ethyl at C-5 and C-6 so write 5,6-diethyl-4-methyl
5.So full name is 3-chloro-5,6-diethyl-4-methyloctane
03
July
2020

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IUPAC Names of Alkyl Halides
1-bromobutane
1.There are four Cs in the chain, so chain will be called butane
2.Bromo is nearer from right side, so start numbering from right side
3.-Br is at C-1
4.There is no substituent
5.So full name is 1-bromobutane
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July
2020

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Practice Questions
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July
2020

11. OrientColleges Orient193
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Practice Questions
03
July
2020