Nội dung text Hydrocarbon’s reviewed ()().pdf
Alkanes And Cycloalkane Nomenclature: -> Rules for naming alkanes are 1) select a longest continuous chain of Carbon atom Consider it as a parent atom . CCcCC 2) Number the longest chain from one end or other so to give the Carbon Carrying substituent and the lowest possible number 2 2 34 5 CH3-CH - CH2-CH2-CH3 I CH3 3) Name the substituent along withits position by indicating the number of carbon atom to which it is attached before parent name & 2 34 5 CH3-CH - CH2-CH2-CH3 in3 2methyl pentane 4) Whentwo or more subsituent are attached ,they are named in alphabetical order along with position before parent name C2H5 CH3 5 Y 13 12 I CH3-CH2-CH-CH-CH3 3 ethyl-2-methyl pentanc 5) When the same substituent is used more than once, a prefix di , tri , tetra is used before substituent name position of each substituent is indicated by separate number eprepare.org
-9 3 &3 I CH3-CH2- - CH - CH3 is 2 , 3-dimethyl pentane 5) when two or more substituent are attached to the same Carbon atom , The number of that Carbon atom is repeated. CH3 22 31 Y 5 CH3-CH2-c - CH2-CH3 as 3. 3 dimethyl pentane 6) When there are more than one longest chain, select the chain which Carries more substituent 3 Y 5 6 CH3-CH2-CH-CH2-CH2-CH3 ap a CH3 - - CH3 3 ethyl-2-methyl hexane Cycloalkane: 1) Cycloalkane are named by placing prefix cyclo-to the name of alame having the same number of carbon atom as in the ring . CH2 CH2- / Ha cyclopropane 2) The substituent cycloalkanes are named as alkykydoalkones CH3 I X 2 methylcyclopentane eprepare.org