A dibasic organic acid gave the following results on analysis : `0.2496 gm` of acid gave `0.3168 gm CO_2` and `0.0864 gm H_2 O` Further, `0.1092 gm` of acid was exactly neutralised by `21 ml` of `N//10 NaOH`. Calculate the molecular formula of the acid and write down its structural formula.

Explanation

To solve the problem step by step, we will first determine the percentage composition of carbon, hydrogen, and oxygen in the dibasic organic acid using the provided data. Then, we will calculate the molecular formula based on the results of the neutralization reaction.

### Step 1: Calculate the percentage of Carbon (C)

The mass of carbon in CO₂ can be calculated using the formula:
\[ \text{Percentage of C} = \left( \frac{12}{44} \times \frac{\text{mass of CO}_2}{\text{mass of acid}} \right) \times 100 \]
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