Carbocation rearrangements from drawn cations

14 questions on Carbocation rearrangements from drawn cations from the General Organic Chemistry III: Reaction Intermediates chapter: 3 NEET level, 6 JEE Main, 5 JEE Advanced. Each one opens with its answer and solution.

• The secondary carbocation shown rearranges by a single 1,2-shift to a more stable cation. Which structure shown is that cation? NEET level, drawn structure
• The primary carbocation shown rearranges by a single 1,2-shift to a more stable cation. Which structure shown is the product cation? NEET level, drawn structure
• The secondary carbocation shown undergoes a single 1,2-methyl shift. Which structure shown is the cation formed? NEET level, drawn structure
• The primary carbocation shown undergoes ring expansion by a 1,2-alkyl shift (a ring C-C bond migrates to the cationic carbon). Which structure shown is the cati... JEE Main level, drawn structure
• The primary carbocation shown rearranges by a single 1,2-shift. Which structure shown is the most stable cation obtainable in this way? JEE Main level, drawn structure
• The primary carbocation shown undergoes a 1,2-phenyl shift (through a bridged phenonium ion). Which structure shown is the cation formed? JEE Main level, drawn structure
• The primary carbocation shown can rearrange through successive 1,2-hydride and 1,2-methyl shifts. Count the cation shown together with every distinct secondary ... JEE Main level, drawn structure
• The secondary carbocation shown rearranges by a single 1,2-shift to the most stabilised cation reachable by one shift. Which structure shown is that cation? JEE Main level, drawn structure
• The secondary carbocation shown undergoes a single 1,2-hydride shift to give a cation stabilised by the aromatic ring. Which structure shown is the cation forme... JEE Main level, drawn structure
• The alcohol shown is heated with concentrated sulfuric acid. Dehydration proceeds through a carbocation that rearranges before proton loss. Which structure show... JEE Advanced level, drawn structure
• The alkene shown reacts with HBr. Which of the structures shown are carbocation intermediates that actually lie on the pathway to the products (the cation forme... JEE Advanced level, drawn structure
• The alkene shown adds HBr through a carbocation. Bromide captures both the first-formed cation and the cation formed after a 1,2-hydride shift, giving two const... JEE Advanced level, drawn structure
• The secondary carbocation shown first undergoes ring expansion and the resulting cation then undergoes one 1,2-hydride shift. Which structure shown is the most ... JEE Advanced level, drawn structure
• The cation shown is generated in solution and rearranges. Which statements are correct? Select all that apply. JEE Advanced level, drawn structure