Atmospheric pressure recorded in different cities are as follows

Cities p in N/m2
Shimla 1.01×105
Bangalore 1.2×105
Delhi 1.02×105
Mumbai 1.21×105

The liquid will boil first at -

1. Shimla

2. Bangalore

3. Delhi

4. Mumbai

Hint: Boiling point directly proportional to atmospheric pressure

Shimla has the lowest atmospheric pressure among all the four cities. Thus, at Shimla liquid will boil first because lower the atmospheric pressure, lower is the boiling point.