The IUPAC name of C H_3 C CCH (C H_3 )_2 is

MCQ

The $ IUPAC$ name of $C{H_3}C \equiv CCH{(C{H_3})_2}$ is

✓
$4-$ methyl $-2-$ pentyne
B
$4, 4-$ dimethyl $-2-$ butyne
C
Methyl isopropyl acetylene
D
$2-$ methyl $-4-$ pentyne

✓

Answer

Correct option: A.

$4-$ methyl $-2-$ pentyne

a
$\begin{matrix} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}} \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,| \\ {{H}_{3}}C-C\equiv C-CH \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,| \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}} \\ \end{matrix}$ is the required structure.

Now, we start numbering from the leftmost carbon as by doing that, the triple bond will be on $2^{nd}$ carbon.

Hence, the name of the compound will be $4$ methyl-$2$-pentyne as there are $5$ carbons on the parent chain.

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