[figure] The ratio of number of oxygen atoms to bromine atoms in the product Q is 10-1.
Answer
15
Solution
[figure]
–OC2H5 is o,p-directing; para is less hindered ⇒ P = p-nitrophenetole
∵ in P the two positions ortho to –OC2H5 are also meta to –NO2 ⇒ both Br enter there
Q: O atoms = 1 + 2 = 3; Br atoms = 2
⇒ ratio = 32 = 1.5 = 15 10-1
Answer: 15