Which alkane, having a molecular weight of `86`, will form only two monobromo alkanes?

Explanation

To solve the problem, we need to determine which alkane with a molecular weight of 86 will yield only two monobromo alkanes upon bromination. Let's break this down step by step.

### Step 1: Determine the Molecular Formula of the Alkane
The general formula for alkanes is given by:
\[ C_nH_{2n+2} \]
The molecular weight of carbon (C) is approximately 12 g/mol, and for hydrogen (H), it is approximately 1 g/mol.

### Step 2: Set Up the Equation
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