The following words are modified such that all the letter are sorted in alphabetical order. Then all vowels are moved to first with out changing the order. If all these words are arranged in alphabetical order which word comes third. Ex: cracku $$\Rightarrow$$ ackru $$\Rightarrow$$ auckr

House, Tree, Water, Friend, Chair, Phone, Flower

Sorting each word alphabetically:

House → ehosu; Tree → eert; Water → aertw; Friend → definr; Chair → achir; Phone → ehnop; Flower → eflorw

Move all vowels to the front (without changing their order):

House → eouhs; Tree → eert; Water → aertw; Friend → eidfnr; Chair → aichr; Phone → eohnp; Flower → eoflrw

aertw, aichr are the first two as they are starting with 'a'.

Among the words that start with 'e', tree will be ranked third.

So, tree is the answer.