SN1 vs SN2 preference and rate order for drawn substrates

13 questions on SN1 vs SN2 preference and rate order for drawn substrates from the Organic Reaction Mechanisms III: Nucleophilic Substitution chapter: 4 NEET level, 5 JEE Main, 4 JEE Advanced. Each one opens with its answer and solution.

• The tertiary bromide shown is warmed in aqueous ethanol with no added base or other nucleophile. Which mechanism operates for the substitution? NEET level, drawn structure
• The primary bromide shown is treated with NaI in dry acetone under the same conditions as ethyl bromide. How does its rate compare with that of ethyl bromide? NEET level, drawn structure
• The aryl bromide shown is heated with dilute aqueous NaOH. What is observed under ordinary laboratory conditions? NEET level, drawn structure
• The primary chloride shown undergoes solvolysis in aqueous acetone far faster than a simple primary alkyl chloride such as ethyl chloride. What is the main reas... NEET level, drawn structure
• The primary bromide shown reacts with NaI in acetone. Which of the structures A to D reacts most slowly with NaI in acetone under identical conditions (assume o... JEE Main level, drawn structure
• The secondary bromide shown solvolyses slowly in 80 percent aqueous ethanol at 25 degrees C. Which of the structures A to D solvolyses fastest under the same co... JEE Main level, drawn structure
• The bicyclic tertiary bromide shown does not react with ethanolic AgNO3 or with NaI in acetone, even on prolonged heating. What is the reason? JEE Main level, drawn structure
• The secondary bromide shown (configuration not specified) can react by S_N1 or S_N2 depending on conditions. Which of the following changes would favour S_N2 ov... JEE Main level, drawn structure
• The primary allylic chloride shown (double bond geometry not specified) can react by either pathway. Select all correct statements. JEE Advanced level, drawn structure
• The primary sulfonate ester shown is treated with NaN3 at the same concentration in four different solvents. In which solvent is the S_N2 reaction fastest? JEE Main level, drawn structure
• The secondary allylic chloride shown (double bond geometry and configuration not specified) is hydrolysed in water by a pure S_N1 pathway. Assume the allyl cati... JEE Advanced level, drawn structure
• The tertiary bromide shown is warmed in ethanol (no added base). Counting only constitutionally distinct neutral organic products formed through the carbocation... JEE Advanced level, drawn structure
• The enantiopure secondary benzylic chloride shown is studied under two conditions: (i) NaN3 at high concentration in DMF, and (ii) hydrolysis in aqueous acetone... JEE Advanced level, drawn structure