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Chemistry Question on Alkanes

IUPAC name of CH3CH=C∣ CH2 ∣ CH3  CH3C{{H}_{3}}CH=\underset{\begin{aligned} & | \\\ & C{{H}_{2}} \\\ & | \\\ & C{{H}_{3}} \\\ \end{aligned}}{\mathop{C}}\,C{{H}_{3}}

A

2-ethylbutene

B

2-ethylbut-2-ene

C

3-methylpent-2-ene

D

3-methylpent-3-ene

Answer

3-methylpent-2-ene

Explanation

Solution

The IUPAC name of the given compound is,
CH3CH=C∣ C2H5 CH3C{{H}_{3}}CH=\underset{\begin{smallmatrix} | \\\ {{C}_{2}}{{H}_{5}} \end{smallmatrix}}{\mathop{C}}\,C{{H}_{3}} Or CH31 −CH2 =C3∣ 4CH2 ∣ 5CH3  −CH3\overset{1}{\mathop{C{{H}_{3}}}}\,-\overset{2}{\mathop{CH}}\,=\underset{\begin{aligned} & | \\\ & ^{4}C{{H}_{2}} \\\ & | \\\ & ^{5}C{{H}_{3}} \\\ \end{aligned}}{\overset{3}{\mathop{C}}}\,-C{{H}_{3}} So, the name is - 3-methyl pent-2-ene.