One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of $44\text{ amu}$. The alkene is:
- (a)ethene
- (b)propene
- (c)1-butene
- (d)2-butene
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Aldehydes and Ketones - ISC Class 12 Chemistry Questions with Answers, Page 4
72 past-paper questions on Aldehydes and Ketones from ISC Class 12 Chemistry papers (2027-2018), newest first, in full. Questions 61-72 are on this page, 20 to a page. Tap "Show answer" under a question to see its answer.
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Give one chemical test for each to distinguish between the following pairs of compound:
(i)
Acetaldehyde and benzaldehyde
(ii)
Acetone and acetic acid
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How will you bring about the following conversions? (Give equation).
(a)
Acetic acid to acetone
(b)
Formaldehyde to urotropine
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Write chemical equations to illustrate each of the following name reactions:
(a)
Rosenmund’s reduction
(b)
Clemmensen’s reduction
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A ketone A ($\text{C}_4\text{H}_8\text{O}$) which undergoes Iodoform reaction gives compound B on reduction. B on heating with $\text{conc. H}_2\text{SO}_4$ at $443\text{ K}$ gives a compound C which forms ozonide D. D on hydrolysis with Zn dust gives only E. Identify the compounds A to E. Write the Iodoform reaction with compound A.
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How will you convert the following: (Give balanced equation)
(i)
Benzoyl chloride to benzaldehyde.
(ii)
Methyl chloride to acetic acid.
(iii)
Acetic acid to methane.
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(i)
Write chemical equations to illustrate the following name reactions:
(1) Aldol condensation.
(2) Cannizzaro’s reaction.
(3) Benzoin condensation.
(ii)
Identify the compounds A and B in the given reactions:
(1) $\text{Benzene} \xrightarrow[\text{anhydrous AlCl}_3]{\text{CH}_3\text{Cl}} \text{A} \xrightarrow{\text{alk. KMnO}_4} \text{B}$
(2) $\text{CH}_3\text{COCH}_3 \xrightarrow[\text{HNO}_3\text{ (conc.)}]{[\text{O}]} \text{A} \xrightarrow{\text{PCl}_5} \text{B}$
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(i)
Give balanced chemical equations for the following reactions:
(1) Acetaldehyde reacts with hydrogen cyanide.
(2) Acetone reacts with phenyl hydrazine.
(3) Acetic acid is treated with ethanol and a drop of conc. $\text{H}_2\text{SO}_4$.
(ii)
Give one chemical test each to distinguish between the following pairs of compounds:
(1) Acetone and benzaldehyde.
(2) Phenol and benzoic acid.
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(i)[3.0]
Write the product(s) of the following reactions:
(1) $\text{CH}_3\text{COCH}_3 + \text{H}_2\text{NOH} \rightarrow$
(2) $2\text{ C}_6\text{H}_5\text{CHO} + \text{conc. NaOH} \rightarrow$
(3) $\text{CH}_3\text{COOH} \xrightarrow{\text{Cl}_2/\text{P}}$
(ii)[2.0]
Give one chemical test each to distinguish between the following pairs of compounds:
(1) Benzaldehyde and Benzoic acid
(2) Propanal and Propanone
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(i)
Write chemical equations to illustrate the following name reactions:
(1) Clemmensen’s reduction
(2) Rosenmund’s reduction
(3) HVZ reaction
(ii)
Explain why:
(1) Acetaldehyde undergoes aldol condensation, but formaldehyde does not.
(2) Acetic acid is a weaker acid as compared to formic acid.
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(i)[3.0]
Write the chemical equations to illustrate the following name reactions:
(1) Wolff-Kishner reduction.
(2) Aldol condensation.
(3) Cannizzaro reaction.
(ii)[2.0]
Account for the following:
(1) $\text{CH}_3\text{CHO}$ is more reactive with $\text{HCN}$ than $\text{CH}_3\text{COCH}_3$.
(2) Carboxylic acids are stronger acids than phenol.
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(i)
Give balanced equations for the following reactions:
(1) Benzaldehyde reacts with hydrazine.
(2) Acetic acid reacts with phosphorous pentachloride.
(3) Acetone reacts with sodium bisulphite.
(ii)
Give one chemical test each to distinguish between the following pairs of compounds:
(1) Ethanol and acetic acid
(2) Acetaldehyde and benzaldehyde
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