Upon treatment with a catalytic amount of an acid such as HCl in ethanol, 1,4-pentadiene undergoes rearrangement to an isomer that is more stable than the starting compound. Draw the structure of this isomer and the mechanism by which it is formed. Use the curved arrow formalism to depict all bond-forming and bond-breaking steps, and show all intermediates.

the structure of this isomer and the mechanism by which it is formed is shown on the first uploaded image

Explanation:

clouds form

solid ice forms on leaves.

water droplets form on grass.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.