Explanation
Catching the earliest train which gives us the chance to do some shopping
ابتدائی ٹرین پکڑنا جس سے ہمیں کچھ خریداری کرنے کا موقع ملتا ہے۔
The word "chance" is appropriate here
because it highlights the idea of the potential or likelihood of being able to do some shopping after catching the train.