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Ask iit jee aieee pet cbse icse state board experts Expert Question: NOMENCLATURE OF ORGANIC COMPOUNDS
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[Post New]4 Aug 2007 20:04:21 IST
    Subject: NOMENCLATURE OF ORGANIC COMPOUNDS
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PRACHI20 (0)

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SIR IWANT TO KNOW IN NAMING OF COMPOUNDS WHICH HAVE MORE THAN TWO FUNCTIONAL GROUPS.CARBOXYLIC ACIDS HAVE PREFIX NAME AS CARBOXY BUT IT IS THE MOST SENIOR GROUP .SO HOW CAN THEIR BE GROUP  WHICH IS MORE SENIOR THAN COOH ACIDS.SO THAT  IT IS PREFIXED AS CARBOXY.AND IF THEIR DOESNT EXIST AN GROUP SENIOR TO COOH ACIDS.THEN WHY CARBOXY PREFIX EXIST.PLEASE SOLVE IT WITH HELP OF AN EXAMPLE
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[Post New]4 Aug 2007 20:07:56 IST
    Subject: NOMENCLATURE OF ORGANIC COMPOUNDS
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astronautameya (267)

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only sulphonic acids have more priority in naming than carboxylic acids.

e.g if a compound has -OH , -COOH and -SO3H, then we name it as hydroxy, carboxy, sulphonic acid


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[Post New]5 Aug 2007 21:31:58 IST
    Subject: Re:NOMENCLATURE OF ORGANIC COMPOUNDS
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garima_1211 (12)

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Sulphonic acids hv higher priority as compared to caboxylic acid.
if Sulphonic acid and caboxylic acid r present together in a compound we use the pefix carboxy.
 
The structure 4 Sulphonic acid is R-SO3H.
 
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[Post New]5 Aug 2007 21:53:09 IST
    Subject: Re:NOMENCLATURE OF ORGANIC COMPOUNDS
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madhusudan.chavan (777)

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As per the list of groups in priority order in NCERT XI book carboxylic acid has highest priority. However in one of the books sulphonic acid group has been shown higher priority than carbocylic acid group.
The compound CH2COOH
                       CHCOOH
                       CH2COOH 
is named as propane-1,2,3-tricarboxylic acid.
The compound
HOOC-H2C-CH-CH2-CH2-COOH
                  CH2COOH
is named as 3-(carboxymethyl)hexanedioicacid.
Hope above examples would clear your doubt about using carboxy suffix. 
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