JAMB Chemistry 2019 Objective — Question 9

Question 9 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

The IUPAC name of H₃C–CH(CH₃)–CH=CH–CH₃ is

A. 2-methylpent-4-ene
B. Hex-2-ene
C. methylpent-2-ene
D. 4-methylpent-2-eneCorrect

Explanation

Careful inspection shows a double bond between the second and third carbons from the right, with a methyl branch. The correctly numbered structure gives the compound 4-methylpent-2-ene. (Note: the source's key letter for this item was recorded as C in the answer key, but its own structural derivation concludes 4-methylpent-2-ene, matching option D — flagged as a possible letter/key mismatch in the source.)

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