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Carbon and its Compounds — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceCarbon and its Compounds5 Marks
Question
Raina while doing certain reactions observed that heating of substance ' $X$ ' with vinegar like smell with a substance ' $Y$ ' (which is used as an industrial solvent) in presence of conc. Sulphuric acid on a water bath gives a sweet-smelling liquid ' $Z$ ' having molecular formula $C _4 H _8 O _2$. When heated with caustic soda $( NaOH )$, ' $Z$ ' gives back the sodium salt of and the compound ' $Y$ '
Identify ' $X$ ', ' $Y$ ', and ' $Z$ '. Illustrate the changes with the help of suitable chemical equations.
✓

Answer

$X$ - Ethanoic acid/ acetic acid/ $CH _3 COOH$
$Y$ - Ethanol/ Ethyl alcohol/ $C _2 H _5 OH$
$Z$ - Ethyl ethanoate/ Ester $- CH _3 COOC _2 H _5$


$\underset{\text { (Ethanoic acid) }}{CH_3-COOH}+\underset{\text { (Ethanol) }}{ CH_3CH_2OH } {\xrightarrow{\text { Add }}} \underset{\text { (Ester) }}{ CH _3- \underset{||}{C}-O- CH _2- CH _3}$
$CH _3 COOC _2 H _5 \xrightarrow{ NaOH } C _2 H _5 OH + CH _3 COONa$

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