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.

Can anyone explain 1. review your spectrometry data and use the known elements to identify the star's composition. which unknown elements make up this star? justify your element selections. 2. in parts i and ii of the lab, what happened to the electrons of each element to produce the different colors of light? explain your answers using important terms from the lesson and information provided in the laboratory. 3. stars composed of heavier (more massive) elements are often slightly older than stars made predominantly from hydrogen and helium. based on your data, is the newly discovered star a younger star? explain your answer.