Question

Arrange the following species in increasing order of bond angle NF3, NCI3, NBr3, NI3​

Answer 1

Answer:

NF3 < NCl3 < NBr3 < NI3.

Explanation:

the size of the bond angle would be directly related to the size of the halogen atom. Since I is larger than Br, the INI angle will be slightly larger than the BrNBr angle. So, in INCREASING angle, they would be in the same order that you have written them: NF3 < NCl3 < NBr3 < NI3.

Nitrogen trichloride and nitrogen trifluoride has chlorine and fluorine atoms respectively but we know that down the group fluorine comes first and than chlorine and also atomic size goes on increasing down the group.so bond length in case of nitrogen chloride would be longer than nitrogen fluoride and also we know that bond angle increases with increase in bond length hence nitrogen chloride has more bond angle compare to nitrogen fluoride

Hope it helps you !