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Hydrocarbons — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryHydrocarbons3 Marks
Question
For the following compound, write structural formulas and IUPAC names for all possible isomers having the number of double or triple bond as indicated:
C5H8 (one triple bond).
✓

Answer

$\text{H}\stackrel{1}{\hbox{C}}\equiv\stackrel{2}{\hbox{C}}-\stackrel{3}{\hbox{C}}\text{H}_2-\stackrel{4}{\hbox{C}}\text{H}_2-\stackrel{5}{\hbox{C}}\text{H}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{(I)}$
$\text{H}_3\stackrel{1}{\hbox{C}}-\stackrel{2}{\hbox{C}}\equiv\stackrel{3}{\hbox{C}}-\stackrel{4}{\hbox{C}}\text{H}_2-\stackrel{5}{\hbox{C}}\text{H}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{(II)}$
$\text{H}_3\stackrel{4}{\hbox{C}}-\stackrel{3}{\hbox{C}}\text{H}-\stackrel{2}{\hbox{C}}\equiv\stackrel{1}{\hbox{C}}\text{H}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{(III)}$
The IUPAC name of
Compound (I) is pent-1-yne,
Compound (II) is pent-2-yne, and
Compound (III) is 3-Methylbut-1-1-yne.

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