Hill used dye for his famous Hill reaction

Options

A. Dichloroplenol Indophenol (DCPIP)
B. Sulphur green
C. Methylene blue
D. Eosine

Answer

**Step-by-Step Solution:**

1. **Identify the Scientist and Reaction**: The question refers to the Hill reaction, which was conducted by scientist Robert Hill. This reaction is a crucial part of the photosynthetic process.

2. **Understand the Purpose of the Hill Reaction**: The Hill reaction is used to measure the rate of photosynthesis by observing the electron transport chain in photosynthesis. It specifically focuses on the light-dependent reactions.

3. **Identify the Dye Used**: In his experiments, Robert Hill used a specific dye that can be reduced by the photosynthetic electron transport chain. This dye is known as DCPIP.

4. **Define DCPIP**: DCPIP stands for dichlorophenol indophenol. It acts as an artificial electron acceptor in the Hill reaction, substituting for NADP+, which is the natural electron carrier in photosynthesis.

5. **Conclusion**: Therefore, the dye used by Hill in his famous Hill reaction is DCPIP (dichlorophenol indophenol).

**Final Answer**: The dye used in Hill's reaction is DCPIP (dichlorophenol indophenol).

---