\( 4 . \) 2-Methylpropane
(excess) \( + Br _{2} \frac{h v }{127^{\circ} C } \) - Major Monobrominated Product, \( P \) If all the products are only monobrominated products, then \( \% \) of \( P=Z \) (approx.). What is the value of \( \frac{2}{11} ? \)
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