Question

CH₃-CH - CH₂ - CH3
1
C6H5

find the parent name &​

Answer 1

Straight chain hydrocarbons are named according to the number of carbon atoms: CH4, methane; C2H6 or H3C-CH3, ethane; C3H8 or H3C-CH2-CH3, propane; C4H10 or H3C-CH2- CH2-CH3, butane; C5H12 or CH3CH2CH2CH2CH3, pentane; C6H14 or CH3(CH2)4CH3, hexane; C7H16, heptane; C8H18, octane; C9H20, nonane; C10H22, CH3(CH2)8CH3, ...Therefore its base name should be propene. And as far as the lowest locant number is concerned, since double bond is on terminal carbon atom, hence locant no. should be 1. Therefore the IUPAC name of CH3-CH=CH2 is 1-propene or prop-1-ene.CH3-CH=CH-CH3. The longest continuous chain in this compound contains four carbon atoms. The parent. structure would be named but + ene (to denote the double bond) Number the carbon atoms in' the longest chain in such a way that the carbon atoms containing the double bond have the lowest possible numbers.