Question

3 attempts left Check Give the TUPAC name for each compound. OH CH,CH(CH, ACH (select) v OH b. CHsCH212CHCHCH2CHs (select) v (select) v CH (select) vl(select OH d. CH3CH CH2 CHCHCH2CHCH2CH3 CH CH 'select) H H select) H H Select

Answer 1

CH3CH(OH)(CH2)4CH3

Rules for naming -

1) select the longest possible hydrocarbon chain (parent chain) and number each carbon in an order such that the functional group gets lowest possible number .

eg-      ¹CH3²CH(OH)³CH2⁴CH2⁵CH2⁶CH2⁷CH3 (CORRECT)

AND NOT    ⁷CH3⁶CH(OH)⁵CH2⁴CH2³CH2²CH2¹CH3 (INCORRECT)

2) COUNT THE NUMBER OF CARBONS IN THE PARENT CHAIN,Begin the name using abbreviations like meth,eth,prop,but,pent ...for 1,2,3,4,5 ..carbons respectively followed by the suffix of the principle functional group

3) write the functional group as suffix along with its respective position.In case more than one functional group or substituent is present ,the one having higher mass is taken to be the principle function and written as suffix,rest are treated as substituents .Substituents are named using their specific prefixes preceded by their positional number.

¹CH3²CH(OH)³CH2⁴CH2⁵CH2⁶CH2⁷CH3  

Name- Heptan-2-ol or 2-heptanol   (ol is the suffix for alcohol )

2)⁶CH3⁵CH2-⁴CH(C2H5)³CH(OH)²CH2¹CH3

Name= 4-ethyl-hexan-3-ol

4)⁹CH3⁸CH2⁷CH2⁶CH(CH3)⁵CH(CH2CH3)⁴CH2³CH(OH)²CH2¹CH3

5-ethyl-2-methyl-non-3-ol [alphabetical order to be followed in naming the substituents, ethyl comes before methyl]

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