Ncert Exercises & Solutions

Question 13.3:-

For the following compounds, write structural formulas and IUPAC names for all possible isomers having the number of a double or triple bond as indicated :

(a) C4H8 (one double bond)

(b) C5H8 (one triple bond)

(a) The following structural isomers are possible for C4H8 with one double bond:

$H_{2} \overset{1}{C} = \overset{2}{C H} - {\overset{3}{C H}}_{2} - {\overset{4}{C H}}_{3}$
$(I)$
${\overset{1}{C H}}_{3} - \overset{2}{C H} = \overset{3}{C H} - {\overset{4}{C H}}_{3}$
$(I I)$
$\overset{1}{C H_{2}} = \overset{2}{C} - \overset{3}{C H_{3}}$
$|$
$C H_{3}$
$(I I I)$

The IUPAC name of

Compound (I) is But-1-ene,

Compound (II) is But-2-ene, and

Compound (III) is 2-Methylprop-1-ene.

(b) The following structural isomers are possible for $C_{5} H_{8}$ with one triple bond:

$H \overset{1}{C} = \overset{2}{C} - \overset{3}{C} H_{2} - \overset{4}{C} H_{2} - \overset{5}{C} H_{3}$
$(I)$
$H_{2} \overset{1}{C} - \overset{2}{C} = \overset{3}{C} - \overset{4}{C} H - \overset{5}{C} H_{3}$
$(I I)$
$H_{2} \overset{4}{C} - \overset{3}{C} H - \overset{2}{C} = \overset{1}{C} H$
$|$
$C H_{3}$
$(I I I)$

The IUPAC name of

Compound (I) is Pent-1-yne, Compound

(II) is Pent-2-yne, and

Compound (III) is 3-Methylbut-1-ene

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