Question

please answer this question​

Answer 1

Answer:

Explanation:

this question is related to chemical bonding london forces

boiling point directly proportional to surface area

here all have equal surface area

boiling point is inversely proportional to covalent character

means less covalent character more boiling point

boiling point  inversely proportional to size of anion

nh2 ++is bigger than nh+++

so 4 3 1 2