What are products of the following reactions?
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Step 1: Recognize the reaction type. This is a hydroboration-oxidation reaction of an alkyne. The reagents used are R2BH/THF followed by HO⁻, H2O2, and H2O.

Step 2: Understand the regioselectivity. Hydroboration-oxidation of terminal alkynes leads to the formation of an aldehyde due to anti-Markovnikov addition of water across the triple bond.

Step 3: Analyze the first step (hydroboration). The R2BH adds to the less substituted carbon of the terminal alkyne, forming an organoborane intermediate.

Step 4: Analyze the second step (oxidation). The organoborane intermediate reacts with H2O2 and HO⁻, replacing the boron group with a hydroxyl group (-OH), resulting in an enol intermediate.

Step 5: Tautomerization. The enol intermediate undergoes tautomerization to form the more stable aldehyde product. The final product is an aldehyde with the carbonyl group on the terminal carbon.

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