Preparation of aldehydes and ketones

26 questions on Preparation of aldehydes and ketones from the Aldehydes, Ketones and Carboxylic Acids chapter: 5 NEET level, 11 JEE Main, 10 JEE Advanced. Each one opens with its answer and solution.

• Vapours of butan-2-ol are passed over copper at 573 K. The main organic product is JEE Main level
• Propanenitrile is treated with an ether solution of methylmagnesium bromide and then with dilute aqueous acid. The major organic product is JEE Main level
• An equimolar mixture of calcium ethanoate and calcium propanoate is dry distilled. How many different ketones are expected? (Count CH3COC2H5 only once.) JEE Advanced level
• Benzene (15.6 g) is acylated with excess ethanoyl chloride and anhydrous AlCl3 to give acetophenone in 70% yield. All of the acetophenone obtained is then treat... JEE Advanced level
• 2,2-Dichloropropane is boiled with aqueous KOH. The main organic product is JEE Main level
• Toluene is treated with CO and HCl in the presence of anhydrous AlCl3 and CuCl (Gatterman-Koch). The major product is JEE Main level
• Hydration of which alkyne with dilute H2SO4 and HgSO4 gives an aldehyde? JEE Main level
• Toluene is treated with chromyl chloride CrO2Cl2 in CS2 and the chromium complex formed is then hydrolysed. This is the Etard reaction and the product is NEET level
• Propyne is passed through dilute H2SO4 containing HgSO4 at 333 K. The final product is NEET level
• Ethyl benzoate is treated with one equivalent of DIBAL-H in toluene at 195 K, followed by aqueous work-up. The main product is JEE Main level
• Benzonitrile is treated separately with (X) C2H5MgBr then H3O+, and (Y) one equivalent of DIBAL-H at low temperature then H3O+. The organic products X and Y are... JEE Advanced level
• Ethanenitrile is treated with SnCl2 and HCl, and the resulting imine hydrochloride is hydrolysed with water (Stephen reaction). The product is JEE Main level
• Propanone is formed (alone or together with another product) in which of the following? JEE Advanced level
• Benzene reacts with ethanoyl chloride and anhydrous AlCl3 to give X. X is warmed with I2 and excess aqueous NaOH, and the aqueous layer is then acidified. The o... JEE Advanced level
• Propan-1-ol is treated with pyridinium chlorochromate (PCC) in CH2Cl2. The main product is NEET level
• Ethanoyl chloride is treated with (X) lithium dimethylcuprate (CH3)2CuLi at 195 K and with (Y) excess CH3MgBr followed by H3O+. The organic products X and Y are... JEE Advanced level
• Toluene is treated with CrO2Cl2 in CS2 followed by H3O+ to give A. A is treated with CH3MgBr in ether and then H3O+ to give B. B is oxidised with PCC to give C.... JEE Advanced level
• Propan-1-ol can be converted to propanal, without further oxidation to the acid, by JEE Main level
• Reductive ozonolysis (O3, then Zn/H2O) of 2-methylbut-2-ene, (CH3)2C=CHCH3, gives NEET level
• Which of the following give a ketone as the main product after work-up? JEE Advanced level
• Anisole (C6H5OCH3) reacts with ethanoyl chloride and anhydrous AlCl3. The major product is JEE Main level
• Which of the following sets of reactants give an aldehyde as the main product after the usual work-up? JEE Main level
• Benzoyl chloride is hydrogenated over Pd supported on BaSO4 (partly poisoned). The product is NEET level
• An alkene A (C6H12) gives only one carbonyl compound B on reductive ozonolysis. B gives a yellow precipitate with I2/NaOH. A is JEE Advanced level
• Which of the following statements about the preparation of aldehydes and ketones are correct? JEE Advanced level
• An equimolar mixture of calcium ethanoate and calcium methanoate (formate) is dry distilled. The carbonyl product that is formed from the cross-coupling is JEE Main level