An analust is trying to separate a mixture containing the following four organic compounds

She dissolved the mixture in ether and treated the solution with aqueous `NaOH` solution and finally separated the two fractions: Fraction-I (ether) and Fraction-II (aqueous). Later she acidified Fraction-1 and was able to distill the organic compound(s) into ether to obtain third fraction, Fraction-III. Fraction-III was then treated with aqueous `NaHCO_(3)` and the two layers, ether layer (Fraction-IV) and aqueous layer (Fraction-V) were separated. Also Fraction-I was treated with aqueous `HCl` solution and the two layers, other (Fraction-VI) and aquores layer (Fraction-VII) were seperated. Answer the following three questions based on the above information.
What is true about the species left in fraction-IV?

Options

A. It is stronger acid than carbonic acid
B. It is stronger acid than water
C. It is neutral to moistened litmus paper
D. It cannot be extracted into an aqueous `Ba(OH)_(2)` solution

Answer

b