Hydroboration, oxymercuration, halohydrin formation

29 questions on Hydroboration, oxymercuration, halohydrin formation from the Organic Reaction Mechanisms II: Electrophilic and Radical Reactions chapter: 6 NEET level, 11 JEE Main, 12 JEE Advanced. Each one opens with its answer and solution.

• The major product of propene on treatment with BH3.THF followed by H2O2/NaOH is NEET level
• Oxymercuration-demercuration (Hg(OAc)2, H2O then NaBH4) of but-1-ene gives mainly NEET level
• Ethene reacts with Br2 in water to give mainly NEET level
• Which statement about the hydroboration step of an alkene with BH3.THF is correct? NEET level
• Which reagent sequence converts 2-methylpropene into 2-methylpropan-1-ol? NEET level
• Cyclohexene reacts with Br2 in water. The major product is NEET level
• 1-Methylcyclohexene is treated with Hg(OAc)2, H2O and then NaBH4. The major product is JEE Main level
• 1-Methylcyclohexene is treated with BH3.THF and then H2O2/NaOH. The major product is JEE Main level
• Styrene (C6H5-CH=CH2) is treated with BH3.THF and then H2O2/NaOH. The major product is JEE Main level
• Propene reacts with Br2 in water. The major product is JEE Main level
• 2-Methylpropene reacts with Br2 in water. The major product is JEE Main level
• Assertion: In the hydroboration of a terminal alkene RCH=CH2, boron attaches to the terminal carbon. Reason: Boron is less hindered at the terminal carbon, and ... JEE Main level
• Hex-1-yne is treated with disiamylborane and then with H2O2/NaOH. The major product is JEE Main level
• Cyclopentene reacts with Br2 in water. Which description of the product is correct? JEE Main level
• cis-But-2-ene is treated with BH3.THF and then H2O2/NaOH. The product is JEE Main level
• 1-Methylcyclohexene can be converted into 1-methylcyclohexan-1-ol as the major product by which of the following? (More than one answer may be correct.) JEE Main level
• 1-Methylcyclopentene is treated with BH3.THF and then H2O2/NaOH. Which statements are correct? JEE Main level
• 3-Methylbut-1-ene is treated with HBr (no peroxide) to give A. A is heated with alcoholic KOH (Zaitsev elimination) to give B. B is treated with BH3.THF and the... JEE Advanced level
• 1-Methylcyclohexene is treated with Br2 in water and the resulting bromohydrin is then treated with aqueous NaOH. The final organic product is JEE Advanced level
• (Z)-But-2-ene and (E)-but-2-ene are each treated separately with Br2 in water to give 3-bromobutan-2-ol. How are the two products related? JEE Advanced level
• 2-Methylbut-2-ene is treated separately with (i) BH3.THF then H2O2/NaOH and (ii) Hg(OAc)2, H2O then NaBH4. Which statement is correct? JEE Advanced level
• Cyclohexene is treated with Br2 in methanol as solvent. The major product is JEE Advanced level
• 3,3-Dimethylbut-1-ene is treated with Br2 in water. The major product is JEE Advanced level
• 1-Methylcyclohexene is treated with BD3.THF and then H2O2/NaOH. The major product is JEE Advanced level
• 1-Ethylcyclohexene is treated with BH3.THF and then H2O2/NaOH. How many distinct stereoisomers of the alcohol product are formed in significant amount? Count en... JEE Advanced level
• In which of the following does the major organic product contain a stereocentre? JEE Advanced level
• 1-Methylcyclohexene is treated with Br2 in water to give 2-bromo-1-methylcyclohexan-1-ol. Which statements are correct? JEE Advanced level
• Which of the following alkenes give an alcohol of the same constitution by BH3.THF then H2O2/NaOH as by Hg(OAc)2/H2O then NaBH4? JEE Advanced level
• 1-Methylcyclohexene is treated with Br2 in water and the first-formed bromonium ion is opened by water. Which statements are correct? JEE Advanced level