Question:
Which of the following compounds does not exhibit resonance?
$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OCH}=\mathrm{CH}_{2}$
$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CONH}_{2}$
$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CHCH}_{2} \mathrm{NH}_{2}$
Correct Option: , 4
Solution:
$\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_{2}-\mathrm{NH}_{2}$
No conjugation thus resonance is not possible.