Butane is monohalogenated by a free radical path. Take relative reactivities per hydrogen $1^{\circ }:2^{\circ }$ as $1:3.8$ for chlorination and $1:82$ for bromination. Which statements are correct?

1. A2-Chlorobutane is more than 65% of the monochloro product.
2. B1-Chlorobutane is between 25% and 32% of the monochloro product.
3. C2-Bromobutane is more than 95% of the monobromo product.
4. DThe molar ratio 2-chlorobutane : 1-chlorobutane is 3.8 : 1.