Alkyne hydration, hydroboration and Diels-Alder products

14 questions on Alkyne hydration, hydroboration and Diels-Alder products from the Hydrocarbons chapter: 3 NEET level, 6 JEE Main, 5 JEE Advanced. Each one opens with its answer and solution.

• The alkyne shown is hydrated with dilute H2SO4 and HgSO4. Which structure is the product? NEET level, drawn structure
• The alkyne shown is hydrated with HgSO4/H2SO4. Which structure is the product? NEET level, drawn structure
• The terminal alkyne shown is treated with a hindered borane (such as disiamylborane) and then with H2O2/NaOH. Which structure is the product? NEET level, drawn structure
• The alkyne shown gives two isomeric ketones on hydration with HgSO4/H2SO4. Which of the following alkynes gives only one ketone under the same conditions? JEE Main level, drawn structure
• The terminal alkyne shown is converted with disiamylborane followed by H2O2/NaOH. Which structure is the product? JEE Main level, drawn structure
• The alkyne shown is hydrated with HgSO4/H2SO4. Which structure is the major product? JEE Main level, drawn structure
• The diene shown reacts with acrylonitrile, CH2=CH-CN, by a Diels-Alder reaction. Which structure is the product? JEE Main level, drawn structure
• The dienophile shown is heated with each of the dienes in the options. Which diene essentially fails to give a Diels-Alder adduct because its s-cis conformation... JEE Advanced level, drawn structure
• The diene shown reacts with maleic anhydride in a Diels-Alder reaction. Which statements are correct? JEE Main level, drawn structure
• The dienophile shown reacts with buta-1,3-diene in a Diels-Alder reaction. Which statements about the adduct are correct? JEE Advanced level, drawn structure
• The diene shown reacts with maleic anhydride in a Diels-Alder reaction. How many stereocentres are present in the adduct (count every stereocentre irrespective ... JEE Advanced level, drawn structure
• The alkyne shown is converted to carbonyl compounds by (i) HgSO4/H2SO4 and (ii) hydroboration-oxidation with R2BH followed by H2O2/NaOH. Which statements are co... JEE Advanced level, drawn structure
• The alkyne shown is treated with a hindered borane, then H2O2/NaOH, and the product is then oxidised with Tollens' reagent. Which structure is the final organic... JEE Main level, drawn structure
• The diene shown reacts with propenal (CH2=CH-CHO) in a Diels-Alder reaction. Which structure is the major regioisomer, the so-called 'para' (1,4) adduct? JEE Advanced level, drawn structure