The equilibrium constants for the three reactions:
`A+2B hArr C, " " K=10^(-12)`
`3B+2C to D , " " K=10^4`
`A+3B to E, " " K=10^9`
In which case, the yield of products will be maximum ?

Explanation

To determine in which reaction the yield of products will be maximum, we need to analyze the given equilibrium constants (K) for each reaction. The equilibrium constant provides insight into the extent to which a reaction proceeds to form products.

### Step-by-Step Solution:

1. **Identify the Reactions and Their Equilibrium Constants:**
- Reaction 1: \( A + 2B \rightleftharpoons C \), \( K_1 = 10^{-12} \)
- Reaction 2: \( 3B + 2C \rightleftharpoons D \), \( K_2 = 10^{4} \)
- Reaction 3: \( A + 3B \rightleftharpoons E \), \( K_3 = 10^{9} \)
...