a) The analysis of a liquid organic compound $B$ has led to assign the molecular formula $C_4H_8O$ Reaction with $DNPH$ (dinitrophenylhydrazine) gives a yellow precipitate. Write enviseageables semi-developed formulas for $B$ and their names.
$CH_3CH_2CH_2CHO$ Butanal $CH_3CH(CH_3)CHO$ 2-Methylpropanal $CH_3COCH_2CH_3$ Butanone
b) The compound $B$ does not react with Fehling's solution. Identify it!
$CH_3COCH_2CH_3$ Butanone
c) The compound $B$ comes from the oxidation of an alcohol $A$. Specify its structural formula, name, class(type)!
$CH_3CHOHCH_2CH_3$ Butan-2-ol, a secondary alcohol
d) Alcohol $A$ reacts in the presence of sulfuric acid with an aliphatic carboxylic acid saturates $D$ to form an organic compound $E$ of molar mass equal to $130 \frac{g}{mol}$ . Determine the structural formula of $ E $ and name.
$E$ is an ester of the formula: $C_nH_{2n+1}COOC_4H_9$ $12n$ $+$ $2n$ $+$ $1$ $+$ $12$ $+$ $32$ $+$ $48$ $+$ $9$ $=$ $130$ $n$ $=$ $2$ $E$ is 1-methylpropylpropanoate: $C_2H_5COOC_4H_9$
