After , the second decarboxylation of the Krebs cycle ,.....(i)…...will produce and it goes …....(ii)……... times dehydrogenation .

Options

A. (i) alpha-ketoglutarate (ii) three
B. (i) succinic acid (ii) two
C. (i) succinyl co-A (ii) two
D. (i) malic acid (ii) two.

Answer

To solve the question regarding the Krebs cycle, we need to break it down into steps, focusing on the process of decarboxylation and the subsequent dehydrogenation.

### Step-by-Step Solution:

1. **Understanding the Krebs Cycle**: The Krebs cycle, also known as the citric acid cycle or TCA cycle, is a series of chemical reactions used by all aerobic organisms to generate energy. It begins with the condensation of acetyl-CoA and oxaloacetate to form citrate.

2. **First Decarboxylation**: The first decarboxylation occurs when citrate is converted to isocitrate, and then isocitrate undergoes decarboxylation to form alpha-ketoglutarate. During this process, one molecule of carbon dioxide (CO2) is released.

3. **Second Decarboxylation**: The second decarboxylation occurs when alpha-ketoglutarate is converted to succinyl-CoA. This reaction also releases one molecule of CO2. Thus, after the second decarboxylation, the product formed is succinyl-CoA.

4. **Dehydrogenation Process**: The question mentions "dehydrogenation." In the Krebs cycle, dehydrogenation refers to the removal of hydrogen atoms, which is coupled with the reduction of NAD+ to NADH. After the second decarboxylation (which produces succinyl-CoA), there is a dehydrogenation step that occurs.

5. **Counting Dehydrogenation Steps**: The dehydrogenation process occurs multiple times in the Krebs cycle. After the formation of succinyl-CoA, there is a second dehydrogenation step that occurs as succinyl-CoA is converted to succinate.

6. **Final Answer**: Therefore, after the second decarboxylation of the Krebs cycle, succinyl-CoA is produced, and it undergoes dehydrogenation for the second time.

### Final Answer:
(i) Succinyl-CoA will produce and it goes (ii) 2 times dehydrogenation.

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