To draw the resonance contributors for the compound CH3CH=CH-CH=CH2, we first identify the key features of the molecule. This compound has a conjugated diene system with alternating double bonds, which allows for resonance stabilization.
The main resonance contributors can be drawn by using the electrons in the pi bonds to form new double bonds while moving single bonds to form new charges. Here are the primary resonance structures:
- Structure A: The original structure with the double bonds between the first and second carbons and the third and fourth carbons.
- Structure B: One contribution involves moving the double bond from between C1 and C2 to between C2 and C3, which can create a positive charge on the first carbon.
- Structure C: Another option is to shift the second double bond (between C3 and C4) to the first double bond, moving the double bond to between C4 and C5, leaving a positive charge on C3.
In summary, each resonance contributor highlights the delocalization of electrons within the molecule, helping to stabilize the overall structure. When drawing these structures, ensure to represent all charges, and the placement of pi bonds, while fulfilling the octet rule for each atom. This shows how the molecule can be represented in different ways while retaining the same connectivity.