Reduction, oxidation and HVZ products of drawn carbonyls and acids

14 questions on Reduction, oxidation and HVZ products of drawn carbonyls and acids from the Aldehydes, Ketones and Carboxylic Acids chapter: 1 NEET level, 6 JEE Main, 7 JEE Advanced. Each one opens with its answer and solution.

• The ketone shown is refluxed with zinc amalgam and concentrated HCl. Which structure is the product? NEET level, drawn structure
• The keto-acid shown is heated with hydrazine and KOH in ethylene glycol (Wolff-Kishner), and the mixture is then acidified. Which structure is the product? JEE Main level, drawn structure
• The compound shown is treated with NaBH4 in methanol at 0 degC. Which structure is the product? JEE Main level, drawn structure
• Which statements are correct for the compound shown? JEE Advanced level, drawn structure
• Formic acid is the compound shown. Which statement about its behaviour with Tollens' reagent is correct? JEE Main level, drawn structure
• The aldehyde shown is tested separately with Tollens' reagent and Fehling's solution. The result is JEE Main level, drawn structure
• The acid shown is treated with Br2 and a little red phosphorus (Hell-Volhard-Zelinsky), followed by water. Which structure is the product? JEE Main level, drawn structure
• The acid shown is heated with Br2 and red phosphorus. Which statement is correct? JEE Main level, drawn structure
• The acid shown is treated with Br2/red P and then, without isolating intermediates other than the organic product, with excess aqueous NH3. Which structure is t... JEE Advanced level, drawn structure
• The acid shown is treated with Br2/red P and then heated with aqueous KOH (substitution conditions) followed by acidification. Which structure is the final prod... JEE Advanced level, drawn structure
• The aryl alkane shown is heated with hot alkaline KMnO4 and then acidified. Which statements are correct? JEE Advanced level, drawn structure
• The aldehyde shown is treated with Tollens' reagent; the resulting carboxylate is treated with NaBH4 in water, and the mixture is then acidified and warmed. Whi... JEE Advanced level, drawn structure
• Which statements are correct for the compound shown? JEE Advanced level, drawn structure
• Which statements are correct for the aldehyde shown? JEE Advanced level, drawn structure