Question

IUPAC name of CH3_CH2_CH2_COOH

Answer 1

butanoic acid...................

Answer 2

Its IUPAC name is☆☆ Butanoic acid…☆☆

To understand the nomenclature we should know 4 things(word root,prefix,primary suffix,secondary suffix)…

word root=it indicates the parent chain I.e. longest and continuous chain of carbons (including the carbon of carboxylic acid (—COOH) ).

prefix= certain atoms or group of atoms are treated as substituent I.e. they are branched on carbon atoms like methyl—(—CH3),Ethyl—(—C2H5),fluoro—(—F),amine—(—NH2)

primary suffix=it indicates the nature of bond I.e. whether it may be carbon to carbon single bond ( C—C) then —ane is written, or may be carbon to carbon double bond (C=C) then —ene is written, or if carbon to carbon triple bond then —yne is written and if both double bond and triple bond simultaneously then en+yne.

secondary suffix=it indicates the parental functional group in compound

like for carboxylic acid (—COOH) (—oic acid) is written and for alcohol (—OH) (—ol) is written and so on

for a complete nomenclature

prefix+word root+primary suffix+secondary suffix

for butanoic acid

prefix=*

word root=four continuous carbon chain including (—COOH)

primary suffix=single bond between carbon so (—ane)but due to carboxylic acid instead of ane. anoic acid is written I.e. e of ane is not written

secondary suffix=(—COOH) so —oic acid

on combining all according to rule we get

*but+anoic acid