The esterification equilibrium

Exercise 9

The molecular mass of an ester A is $116\frac{g}{mol}$. By hydrolysis of this ester, two saturated aliphatic compounds are obtained, namely an acid B and an alcohol C. 1) The $ 1.50\;g$ B collected are diluted in water. The solution is titrated by exactly $12.5\;cm^3\;NaOH\;$ 2M. Determine the molar mass, semi-developed the formula and the name of B. 2) C has formula $C_4H_{10}O$ and is oxidized by dichromate in acidic medium to give a compound D which reacts with DNPH, but not with the Schiff reagent. Find the semi-developed formula and the name of D. 3) Write the condensed structural formula of C. Is the molecule chiral? If so, represent both enantiomers and name them. 4) Write the condensed structural formula of the ester A

1) $n_{NaOH}$ $=$ $n_B$ $=$ $2\cdot 0,0125$ $=$ $0,0250$ $M_B$ $=$ $\frac{1,50}{0,0250}$ $=$ $60\frac{g}{mol}$ $M_{C_nH_{2n}O_2}$ $=$ $60$ $12n$ $+$ $2n$ $+$ $32$ $=$ $60$ $n$ $=$ $2$ B is ethanoic acid $CH_3COOH$ 2) $D$ is a ketone $D$ is butanone $CH_3COCH_2CH_3$ 3) $C$ is a secondary alcohol $C$ is butan-2-ol $CH_3C^*HOHCH_2CH_3$ (chiral)