Compound A is an aromatic compound with the molecular formula C8H8. When treated with excess Br2, compound A is converted into compound B, with the molecular formula C8H8Br2.

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.