Oxidation with KMnO4, K2Cr2O7, PCC, Jones

37 questions on Oxidation with KMnO4, K2Cr2O7, PCC, Jones from the Reduction, Oxidation and Hydrolysis in Organic Chemistry chapter: 8 NEET level, 14 JEE Main, 15 JEE Advanced. Each one opens with its answer and solution.

• 1-Butanol is treated with PCC in CH2Cl2. The main organic product is NEET level
• Toluene is heated with alkaline KMnO4 and the mixture is then acidified with H3O+. The product is NEET level
• Cyclohexene reacts with cold, dilute, alkaline KMnO4. The major product is NEET level
• Which of the following gives a red precipitate of Cu2O on warming with Fehling's solution? NEET level
• 2-Methylbut-2-ene, (CH3)2C=CH-CH3, is heated with alkaline KMnO4 and then acidified. The organic products are JEE Main level
• Which alcohol is unaffected by Jones reagent (CrO3/H2SO4/acetone) at room temperature? JEE Main level
• Ethanol is completely oxidised to ethanoic acid by excess acidified K2Cr2O7. Which statements are correct? (Cr goes from +6 to +3.) JEE Main level
• Which compound gives a yellow precipitate of iodoform with I2/NaOH? JEE Main level
• Ethylbenzene is heated with alkaline KMnO4 and then acidified with H3O+. The aromatic product is JEE Main level
• Acetophenone, C6H5-CO-CH3, is warmed with I2 and aqueous NaOH. The products are JEE Main level
• Which of the following give a silver mirror with Tollens' reagent? JEE Main level
• 1-Methylcyclohexene is heated with alkaline KMnO4 and the mixture is acidified. The product is JEE Advanced level
• The compound CH3-CH=CH-CH2-CH2-CH=C(CH3)2 is treated with hot alkaline KMnO4 followed by H3O+. Which statements are correct? JEE Advanced level
• 4-tert-Butyltoluene (C11H16) of mass 7.40 g is heated with excess alkaline KMnO4 and then acidified, giving 4-tert-butylbenzoic acid (C11H14O2) as the only arom... JEE Advanced level
• Three moles of ethanol are oxidised completely to ethanoic acid by acidified K2Cr2O7 (Cr goes from +6 to +3). The number of moles of K2Cr2O7 required is JEE Advanced level
• 1-Propanol is subjected to different oxidants. Which statements are correct? JEE Advanced level
• A straight-chain alcohol C5H12O is optically active and gives a yellow precipitate with I2/NaOH. It is oxidised by Jones reagent to a ketone Z. Z is then treate... JEE Advanced level
• 1,2-Dimethylcyclohexene is heated with hot alkaline KMnO4 and the mixture is acidified. The product is JEE Advanced level
• cis-But-2-ene and trans-but-2-ene are separately treated with cold, dilute, alkaline KMnO4. Which statements are correct? JEE Advanced level
• Toluene on heating with alkaline KMnO4 followed by acidification with H3O+ gives NEET level
• Propan-1-ol is treated with PCC in CH2Cl2. The product is NEET level
• Oxidation of propan-2-ol with Jones reagent (CrO3/H2SO4/acetone) gives NEET level
• Which compound gives a silver mirror with Tollens reagent? NEET level
• Cyclohexene is heated with concentrated alkaline KMnO4 and then acidified with H3O+. The organic product is JEE Main level
• Acetophenone is treated with I2 and excess NaOH, and the mixture is then acidified with H3O+. The products are JEE Main level
• Ethanol is oxidised to ethanoic acid. Taking oxidation numbers by the usual rules (H is +1, O is -2), the oxidation number of the carbinol carbon (the carbon bo... JEE Main level
• Hexane-1,6-diol, HOCH2(CH2)4CH2OH, is oxidised separately with (i) excess PCC in CH2Cl2 and (ii) excess Jones reagent. The products are respectively JEE Main level
• Cyclohexene is treated with cold, dilute, alkaline KMnO4 (Baeyer test). The main organic product is JEE Main level
• 2-Methylpropan-1-ol is oxidised under Swern conditions (DMSO, (COCl)2, then Et3N, -78 degC). The product is JEE Main level
• Which of the following is NOT oxidised to benzoic acid by hot alkaline KMnO4 followed by acidification? JEE Main level
• 4-Methylacetophenone, CH3-C6H4-CO-CH3 (para), is treated with I2/NaOH and then H3O+. The acid obtained is then heated with alkaline KMnO4 followed by H3O+. The ... JEE Advanced level
• Butan-1-ol is oxidised completely to butanoic acid by chromic acid, with the chromium going from Cr(VI) to Cr^3+. The moles of CrO3 consumed per mole of butan-1... JEE Advanced level
• An alkene A, C6H12, gives only propanoic acid on heating with concentrated alkaline KMnO4 followed by acidification. With cold dilute alkaline KMnO4 it gives a ... JEE Advanced level
• Which of the following give benzoic acid on heating with hot alkaline KMnO4 followed by acidification? JEE Advanced level
• Which statements about PCC in CH2Cl2 are correct? JEE Advanced level
• Which statements about Jones reagent (CrO3/H2SO4/acetone) are correct? JEE Advanced level
• Which compounds give a yellow precipitate of iodoform on warming with I2 and NaOH? JEE Advanced level