A hydrocarbon `C_(9) H_(10) (A)` rapidly decolourises cold aquous permanganate and rapidly absorts one molecule of bromine . Vigous hydrogenation of `(A)` gives a compound `(A)` gives a compound `(B)` of the formula `C_(9) H_(18)`. Strong oxidation of `(A)` yileds phyalic acid. Propose a structure for `(A)` and give the basic for your answer.

Explanation

To propose a structure for the hydrocarbon \( C_9H_{10} \) (A) based on the given information, we will follow these steps:

### Step 1: Determine the Degree of Unsaturation
The degree of unsaturation can be calculated using the formula:
\[ \text{Degree of Unsaturation} = \frac{2C + 2 - H}{2} \]
where \( C \) is the number of carbon atoms and \( H \) is the number of hydrogen atoms.
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