Answer:

Introduction:
The compound that is used to give a reddish brown color to glass is Iron Oxide (Fe2O3). Iron oxide is a naturally occurring mineral that is commonly used as a pigment in various industries, including glass manufacturing.

Explanation:
Here is a detailed explanation of why iron oxide is used to give a reddish brown color to glass:

1. Coloring of Glass:
- Glass is a transparent material, but it can be colored by adding certain compounds or pigments to it.
- Different compounds produce different colors in glass, depending on their chemical composition and the concentration used.
- Iron oxide, specifically iron(III) oxide or ferric oxide (Fe2O3), is known for its reddish brown color.

2. Iron Oxide as a Pigment:
- Iron oxide is a commonly used pigment in the glass industry due to its stable and vibrant color.
- The reddish brown color of iron oxide makes it suitable for creating various shades of brown, amber, and red in glass.
- Iron oxide pigments are finely ground powders that are mixed with molten glass during the manufacturing process.

3. Heat Resistance:
- Iron oxide is highly stable and resistant to high temperatures, making it an ideal compound for coloring glass.
- During the glass manufacturing process, the mixture of iron oxide and glass is heated to very high temperatures, allowing the pigment to fuse with the glass.
- The color imparted by iron oxide remains stable even at the elevated temperatures required for glass production.

4. Other Compounds:
- While iron oxide is commonly used for reddish brown coloration, other compounds can also be used to achieve similar colors.
- Manganese oxide (option B) can produce a brown color in glass, but it tends to be more opaque and less vibrant than iron oxide.
- Cobalt oxide (option C) is used to create blue colors in glass, while uranium oxide (option D) is used for yellow or green colors.

Conclusion:
In conclusion, iron oxide (Fe2O3) is the compound that is used to give a reddish brown color to glass. Its stable and heat-resistant properties make it an ideal pigment for the glass industry. Other compounds like manganese oxide, cobalt oxide, and uranium oxide are used for different colors in glass production.