Which of the following is the structure for (2E,4E)-octa-2,4-dien-6-yne?
A) I
B) II
C) III
D) IV
E) V

Question

Which of the following is the structure for (2E,4E)-octa-2,4-dien-6-yne? 
A) I 
B) II 
C) III 
D) IV 
E) V

Quizplus · Accepted Answer

The prefix "octa" indicates that the carbon chain contains eight carbons, and the numbering starts from the end closest to the first double bond. The "2,4-dien-6-yne" indicates that there are two double bonds at carbons 2 and 4, and a triple bond at carbon 6. The stereochemistry between carbons 2 and 4 is indicated by the prefix "2E,4E" which means they are in the E configuration (trans). The correct structure is shown in option IV.

Which of the Following Is the Structure for (2E,4E)-Octa-2,4-Dien-6-Yne