Answer the following: What happens when (write chemical equations): (a) Calcium acetate is…
Answer the following:
(i)[3.0]
What happens when (write chemical equations):
(a) Calcium acetate is subjected to dry distillation.
(b) Acetaldehyde is reduced with hydrogen in the presence of $\text{Zn / Hg}$ and conc. $\text{HCl}$.
(c) Acetic acid is heated with ethyl alcohol in the presence of conc. $\text{H}_2\text{SO}_4$.
(ii)[2.0]
An organic compound [X] with molecular formula $\text{C}_2\text{H}_4\text{O}$ forms compound [Y] on oxidation. Compound [X] undergoes haloform reaction. On treatment with $\text{HCN}$, compound [X] forms a product [Z] which on hydrolysis gives 2-hydroxy propanoic acid.
(a) Write down the structures of compounds [X] and [Y].
(b) Name the product formed when [X] reacts with dil. $\text{NaOH}$.
Answer
Answer (i)
AIWritten by AI (gemini) - it can contain mistakes.
(a) $(\text{CH}_3\text{COO})_2\text{Ca} \xrightarrow{\Delta} \text{CH}_3\text{COCH}_3 + \text{CaCO}_3$
(b) $\text{CH}_3\text{CHO} + 4[\text{H}] \xrightarrow{\text{Zn-Hg / conc. } \text{HCl}} \text{CH}_3-\text{CH}_3 + \text{H}_2\text{O}$
(c) $\text{CH}_3\text{COOH} + \text{C}_2\text{H}_5\text{OH} \xrightarrow{\text{conc. } \text{H}_2\text{SO}_4, \Delta} \text{CH}_3\text{COOC}_2\text{H}_5 + \text{H}_2\text{O}$
Answer (ii)
AIWritten by AI (gemini) - it can contain mistakes.
(a) Structures of compounds [X] and [Y]:
Compound [X]: Acetaldehyde (ethanal), $\text{CH}_3-\text{CHO}$
Compound [Y]: Acetic acid (ethanoic acid), $\text{CH}_3-\text{COOH}$
(b) When acetaldehyde [X] reacts with dilute $\text{NaOH}$, it undergoes aldol condensation to form 3-hydroxybutanal (aldol).
From ISC 2026 Chemistry Paper 1, question 20.