Which reagent is used to convert ethanoic acid into ethanol?

The increasing order of acidic strength of the following in aqueous solution is:

Arrange these carboxylic acids in decreasing order of ease of esterification with $CH_3OH/H^{+}$:
$(I)$ $CH_3-CH(CH_3)-COOH$
$(II)$ $CH_3-CH(CH_3)-CH_2-COOH$
$(III)$ $CH_3-C(CH_3)_2-COOH$
$(IV)$ $(CH_3-CH_2)_3C-COOH$

Give reactions of carboxylic acids in which $C-OH$ bond breaks. $OR$ Give methods of preparation for $(a)$ anhydride $(b)$ ester $(c)$ acid chloride and $(d)$ amide from carboxylic acids.

Which of the following compounds gives carbon dioxide with $NaHCO_3$?

The correct order of acidic character of the following compounds is: