Write resonance structures of ${\mathrm{CH}}_2=\mathrm{CH}-\mathrm{CHO}.$ Indicate relative stability of the contributing structures.

Arrange the following carbocation in decreasing order of their stability with reason.

Write a stable resonating structure for each of the following compound:

${\mathrm{CH}}_2=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}-\mathrm{C}\equiv \mathrm{N}$

Write a stable resonating structure for each of the following compound:

Write a stable resonating structure for the following compound:

Write a stable resonating structure for each of the following compound:

Relative stabilities of the following carbocations will be in order.