Question

3. Explain why the following names are incorrect and give a correct name in each case:
a. 5-octyne
b. 3-pentene
c. 3-buten-1-yne

Answer 1

Answer:

the following names are incorrect because (leaving numbers at beginning) it represents the main chain while by using the no.s in front shows that they are side chains

side chains cannot be so big

side chains end with yl

Explanation:

hope it helps

plz mark me as BRAINLIEST

Answer 2

5-OCTYNE AND 3-PENTENE IS INCORRECT AS NUMBERING IS DONE SO THAT LEAST NUMBER IS GIVEN TO THE FUNCTIONAL GROUPS.

3-BUTEN-1-YNE IS INCORRECT AS DOUBLE BOND IS GIVEN PRIORITY.

Explanation:

• The IUPAC name 5-Octyne is incorrect as numbering is not done in correct order of the priority groups, the triple bond will be numbered as 3 instead of 5. The correct name will be 3-OCTYNE.
• The numbering in 3-pentene is done incorrectly, as the double bond is between 2nd and 3rd carbon so, it will be named as 2-PENTENE as we will give least number to functional groups.
• The priority of double bond is higher than triple bond, so it will be numbered lower than triple bond. So instead of 3-buten-1-yne it will be named as BUT-2-ENE-3-YNE.
• The correct names are shown below: