Following has IUPAC name of:
Correct answer: B. 2, 2, 3, 3 - tetramethyl pentane
- A. 2, 3 - tetramethyl butane
- B. 2, 2, 3, 3 - tetramethyl pentane
- C. 3, 3, 4, 4 - tetramethyl butane
- D. 3, 4 - bis (dimethyl butane)
Explanation
The longest carbon chain in the compound above is of five carbons as shown in the figure below, hence the correct option must have a "pent" mentioned, which is the case for B only. Moreover, as we have 4 methyl side chains, equally distributed on carbons 2 and 3, we will mention the carbon number on which the chains are present. The numbers in the IUPAC name must equal the number of side chains hence we have 4 numbers present at the start of the name of the molecule corresponding to the number of side chains present.
This question appeared on the PMC National MDCAT 2020 paper, which you can sit online with every answer explained.
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About Alkanes
Alkanes are saturated hydrocarbons containing only carbon-carbon and carbon-hydrogen single bonds, with the general formula CnH2n+2 for open chains. Their structure, isomerism, IUPAC nomenclature, physical properties, combustion, free-radical halogenation and conformations are covered, including the difference between substitution in alkanes and addition in unsaturated hydrocarbons.
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