2,2,2-trichloroethanioc acid

Write down structure of the following compounds: 2,2,2-trichloroethanoic acid

The correct increasing order of the acid strength fo acids, butyric acid (I), 2-chlorobutyric acid (II), 3-chlorobutyaric acid (III), 2,2-dichlorobutyric acid (IV) is :

2-chloroethanoic acid is a stronger acid than ethanoic acid . Why ?

2-methylpropanedioic acid

Explain why 2 - fluorobutanoic acid is more acidic than 2 - chlorobutanoic acid.

Write the structural formula of : 2, 2-Dimethylpentanoic acid.