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NCERT Class XI Chemistry Hydrocarbons Solutions

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Question : 21 of 25
Marks: +1, -0
Write structures of all the alkenes which on hydrogenation give 2-methylbutane.
Solution:  
2-Methylbutane is H3C−H2C−HC∣CH3−CH3\mathrm{H}_3\mathrm{C}-\mathrm{H}_2\mathrm{C}-\overset{\mathrm{CH}_3}{\overset{\vert}{\mathrm{HC}}}-\mathrm{CH}_3
The structure of the compounds which on hydrogenation produce 2-methylbutane are:
H3C−CH2−C∣CH3=CH22-Methylbut-1-ene\underset{\text{2-Methylbut-1-ene}}{\mathrm{H}_3\mathrm{C}-\mathrm{CH}_2-\overset{\mathrm{CH}_3}{\overset{\vert}{\mathrm{C}}}=\mathrm{CH}_2}
H3C−CH2=C∣CH3H−CH32-Methylbut-2-ene\underset{\text{2-Methylbut-2-ene}}{\mathrm{H}_3\mathrm{C}-\mathrm{CH}_2=\overset{\mathrm{CH}_3}{\overset{\vert}{\mathrm{C}}}\mathrm{H}-\mathrm{CH}_3}
H2C=CH−CH−CH3∣CH33-Methylbut-1-ene\underset{\text{3-Methylbut-1-ene}}{\overset{\mathrm{CH}_3}{\overset{\vert}{\mathrm{H}_2\mathrm{C}=\mathrm{CH}-\mathrm{CH}-\mathrm{CH}_3}}}
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