List of top Chemistry Questions on Aldehydes And Ketones asked in CBSE CLASS XII

Complete the equation : \[ CH_3CHO + H_2NNH_2 \longrightarrow ? \]
Why is \(CH_3CHO\) more reactive than acetone towards reaction with HCN ?
How do you convert Acetonitrile to Acetone ?
Write the product when benzaldehyde reacts with \(Zn(Hg)/\)conc. HCl.
Write the reaction involved in Etard reaction.
Why are \(\alpha\)-hydrogen atoms of aldehydes and ketones acidic in nature ?
Draw the structure of the semicarbazone of acetone.
Write the name of the reagent used to transform Allyl alcohol to Propenal.
Write a simple chemical test to distinguish between Ethanal and Propanal.
\[ \text{Why are }\alpha\text{-hydrogen atoms of aldehydes and ketones acidic in nature?} \]
\[ \text{Arrange the following compounds in increasing order of their reactivity towards }HCN: \]
\[ CH_3COCH_3,\quad CH_3CHO,\quad (CH_3)_3C-CO-CH_3 \]
Write the reaction involved in Etard reaction.
\[ \text{Write the product when cyclohexanecarbaldehyde reacts with }Zn(Hg)/conc.\;HCl. \]
Draw the structure of the semicarbazone of acetone.
Which of the reactions is used in the conversion of a ketone into hydrocarbon ?
An organic compound (A) with molecular formula C$_3$H$_5$N on reaction with C$_6$H$_5$MgBr followed by hydrolysis, gives a compound (B). Compound (B) forms an orange-red precipitate with 2,4-DNP reagent and does not give iodoform test. It neither reduces Tollens' or Fehling's reagent nor does it decolourise bromine water. On drastic oxidation with chromic acid it gives a carboxylic acid (C) having molecular formula C$_7$H$_6$O$_2$. Identify the compounds (A), (B) and (C). Write the reactions of compound (A) with C$_6$H$_5$MgBr followed by hydrolysis to give compound (B).
An organic compound \(A\) with molecular formula \(C_3H_5N\) on reaction with \(C_6H_5MgBr\) followed by hydrolysis gives compound \(B\). Compound \(B\) forms orange-red precipitate with 2,4-DNP reagent and does not give iodoform test. It neither reduces Tollens' or Fehling's reagent nor decolourises bromine water. On drastic oxidation with chromic acid it gives carboxylic acid \(C\) having molecular formula \(C_7H_6O_2\). Identify \(A\), \(B\), and \(C\). Write the reactions.
Draw structure of the 2,4-dinitrophenylhydrazone derivative of benzaldehyde.
Arrange the following in increasing order of their reactivity towards HCN: Di-tert-butyl ketone, Acetaldehyde, Acetone.
Write the name of the reagent to convert Ethanenitrile to Ethanal.
An organic compound (X) has the molecular formula C5H10O. Draw structures for (X) if it: (I) does not give Tollen's test but gives a positive iodoform test; (II) does not give Tollen's test and iodoform test but undergoes Aldol condensation; (III) undergoes Cannizzaro's reaction.
Give reason for the following:

Nucleophilic addition of ammonia and its derivatives does not occur with carbonyl group in strongly acidic medium.
Give reason for the following:

Alpha (\(\alpha\)) hydrogens of aldehydes and ketones are acidic in nature.
Arrange the following compounds in increasing order of their reactivity towards HCN : $\mathrm{CH_3COCH_3,\ CH_3CHO,\ (CH_3)_3C\text{-}CO\text{-}CH_3}$.
Write the reaction involved in the Etard reaction.