Ncert Exercises & Solutions

Write a test to differentiate between pentan-2-one and pentan-3-one.

lodoform test (yellow ppt. formed when heated with sodium hypohalite) Pentan-2-one gives positive test as it contains — group whereas pentan-3-one does not.

$C H_{2} C H_{2} C H_{2} — C — C H_{3} \to_{(l o d o f o r m t e s t)}^{l_{2} / N a O H} C H l_{3} + C H_{3} + C H_{2} C O O N a$
$C H_{3} C H_{2} — C — C H_{2} C H_{3} \overset{l_{2} / N a O H}{\to} N o y e l l o w p p t, o f C H l_{3}$