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A student was given the structural formulas of several compounds and was asked to give them systematic names. How many did she name correctly? Correct those that are misnamed.

a. 4-ethyl-2-pentyne b. 1-bromo-4-heptyne c. 2-methyl-3-hexyne d. 3-pentyne

Short Answer

Expert verified

Here we have to find out which names are correct:

Only C is correct.

a) 4-methyl-2-hexyne

b) 7-bromo-3-heptyne

c) Correct

d) 2-pentyne

This naming is given according to IUPAC nomenclature.

Step by step solution

01

Rules of IUPAC nomenclature

There are some rules to be followed for the naming of a structure and these are given as follows,

  1. Finding the longest chain.
  2. Numbering the chain according to the priority order of double bond, triple bond and functional group.
  3. a functional group should be written in an alphabetical order, meaning if there is methyl and ethyl group, put the ethyl group at 1st as e comes earlier than m in Alphabets.
02

Final answer

a) Here longest chain is chosen wrong by a student.

b) Triple bond has to be prefer in comparison of bromine substituent.

c) This is correct.

d) We have to give triple bond a lowest possible number.

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