NOMENCLATURE OF ORGANIC COMPOUNDSIUPAC SYSTEM 1NAME OF ORGANIC

NOMENCLATURE OF ORGANIC COMPOUNDSIUPAC SYSTEM 1)NAME OF ORGANIC COMPOUND = PREFIX + ROOT WORD + SUFFIX ROOT : - NATURE & NUMBER OF CARBON ATOMS IN THE CARBON CHAIN. SUFFIX : - TYPE OF BONDS OR FUNCTIONAL GROUPS IN THE CHAIN. PREFIX : - PRESENCE OF OTHER FUNCTIONAL GROUP & THEIR POSITION.

ROOT/ROOT WORD/PARENT NAME /BASE NAME CHAIN LENGTH (NO OF C-ATOMS IN THE CHAIN) ROOT WORD 1 Meth- 2 Eth- 3 Prop- 4 But- 5 Pent- 6 Hex- 7 Hept- 8 Oct-

SUFFIX (for Hydrocarbons) IT SHOWS SATURATION, UNSATURATION, TYPE OF FUNCTIONAL GROUP ON THE C-CHAIN. SUFFIX IS ALWAYS ADDED TO ROOT WORD. SUFFIX NATURE OF CCHAIN ROOT NAME -ane Saturated –C-C- Alkane. -ene Unsaturated –C=C- Alkene. -yne Unsaturated-C C- Alkyne.

Nomenclature of Alkanes , Alkenes & Alkynes Structure/Formula C-atoms Root in chain name Suffix IUPAC NAME. CH 4 1 Meth- -ane Methane C 2 H 6 = CH 3 -CH 3 2 Eth- -ane Ethane C 3 H 8 = CH 3 -CH 2 -CH 3 3 Prop- -ane Propane C 2 H 4 = CH 2=CH 2 2 Eth- -ene Ethene C 3 H 6 = CH 3 -CH=CH 2 3 Prop -ene Propene/Prop 1 -ene C 2 H 2 = CH CH 2 Eth- -yne Ethyne 4 But- -ene But 1 -ene CH 3 -CH 2 -CH=CH 2

IUPAC NAMES SOME EXAMPLES • • • CH 3 -CH 2 -OH HCOOH CH 3 -CH=CH-CH 3 • • • Ethan-1 -Ol Propan-1 -Ol Methanoic acid Ethanoic acid But-2 -ene