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CH\(_3\)C ≡ CCH(CH\(_3\))\(_2\) The IUPAC nomenclature of the compound above is 

Chemistry
JAMB 2025

CH\(_3\)C ≡ CCH(CH\(_3\))\(_2\)

The IUPAC nomenclature of the compound above is 

  • A. 3-ethyl but-2-yne
  • B. 4-methylpent-2-yne
  • C. 2-ethyl but-2-yne
  • D. 2-methyl pent-2-yne
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Correct Answer: Option B
Explanation

The IUPAC name for the compound CH\(_3\)C ≡ CHCH(CH\(_3\))\(_2\) is 4-methylpent-2-yne

First: Name the longest Carbon atom chain, with reference to the shorter route of the position of the triple bond ≡ i.e pent-2-yne (5 Carbon atom with ≡ on C-2)

Secondly: name the substituent functional group. i.e the CH\(_3\) - methyl on C-4 ( 4- methyl)

Thirdly: Combine second and first steps together. i.e 4-methyl and pent-2-yne.

IUPAC Nomenclature of the compound above is 4-methylpent-2-yne - option B

There is an explanation video available below.


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Explanation Video

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