Ncert Exercises & Solutions

Question 13.4:-

Write IUPAC names of the products obtained by the ozonolysis of the following compounds :

(i) Pent-2-ene

(ii) 3,4-Dimethylhept-3-ene

(iii) 2-Ethylbut-1-ene

(iv) 1-Phenylbut-1-ene

(i) Pent-2-ene undergoes ozonolysis as:

$C H_{3} - C H = C H_{2} - C H_{2} - C H_{3} + O_{3}$
$P e n t - 2 o n e ↓ O z o n e$

Part-2-ene ozonide

$↓ Z n + H_{2} O$
$H_{3} C - C H O + C H_{3} - C H_{2} - C H O$
$(i) (i i)$

The IUPAC name of Product (I) is ethanal and Product (II)is propanal.

(ii) 3, 4-Dimethylhept-3-ene undergoes ozonolysis as:

$C H_{3} - C H_{2} - C = C - C H_{2} - C H_{3} + O_{3}$
$| |$
$C H_{3} C H_{3}$
$↓$

$\overset{4}{C} H_{2} - \overset{3}{C} H_{2} - C_{|}^{2} = O + O = C_{|}^{2} - \overset{3}{C} H_{2} - \overset{4}{C} H_{2} - \overset{5}{C} H_{5}$
$\overset{C H_{3}}{1} \overset{C H_{3}}{1}$

The IUPAC name of Product (I)is butan-2-one and Product (II)is Pentan-2-one

(iii) 2-Ethylbut-1-ene undergoes ozonolysis as:

The IUPAC name of Product (I)is pentan-3-one and Product (II)is methanal.

(iv) 1-Phenylbut-1-ene undergoes ozonolysis as:

The IUPAC name of Product (I)is benzaldehyde and Product (II)is

4.4a

The IUPAC name of Product (I)is benzaldehyde and Product (II)is propanal

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