Question

name this compound correctly

CH3CH2 2-methy-5-ethy1-2,4-hexadiene 2 CH2CH2CH3

Answer 1

СНЗ СНЗ СНЗ 8 2 2HC CH27 -с 5 СНЗ ЗнС ЗНС (3E,5Z)-3,4,5,6-tetramethylnona-3,5-d iene longest carbon chain has 9 carbons, the rootword is "non" Since in the given compound two double bonds present at 3rd and 5 th carbon atom, the suffix is "ene". Here methyl group is substitutent at 3,4,5 & 6 th carbon atom .Same groups are present at opposite side of the double bonded carbon atom (E- configuration),Z - configuration at 5 th carbon atom

The IUPAC name of the any compound contains 3 parts prefix+ rootword +suffix Prefix any substitutents rootword longest chain containing most number of carbons if the chain contains 1 carbon meth 2 carbon eth 3 carbon prop 4 carbon but 5 carbon pent 6 carbon hex 7 carbon hept 8 carbon oct 9 carbon non and so on Suffix if the compound contains single bond (C-C) only then suffix ane double bonds (C-C) 'ene triple bonds 'yne For selecting prefix numbering, the substituents numbers has to be given in such way that the sum of the all substituents should be as less as possible For selecting rootword chain, the chain with more number of carbons has to be selected In all the given compounds alkanes are present, hence the suffix is 'ane' in all the four compound For all the compounds, blue coloured part of the name is prefix. red coloured part of the name is rootword and pink coloured part of the name is suffix