write the following compounds in descending order of their acidic strengths
(1) CF₂-CH₂-OH  (2) CF₂H-CH₂-OH (3) CH₃-CH₂-OH

Dear Student,

The acidic strength is depends on the stable conjugate base and for the given molecules the conjugate bases are,
[CF₂CHO^-], [CF₂HCH₂O^-] & [CH₂CH₂O^-]

The inductive effect of F is higher than ethyl molecule which makes F as stable conjugate base by spreading electron density in making of O^- ion stable, hence the descending order of the compounds are as below,

$C{H}_3-C{H}_2-OH < C{F}_2-C{H}_2-OH < C{F}_{2}H-C{H}_2-OH$

Regards.