Which of the following acids on Kolbe’s electrolysis gives ethane?

Which of the following is the strongest acid?

Which of the following is required in Stephen reaction?

Salicylic acid consists of an aldehyde group on the benzene ring other than the primary carboxylic group.

Which of the following products is formed when an aldehyde reacts with an amine in acidic medium?

Which of the following is Tollen’s reagent?

What is the correct order of reactivity towards nucleophilic addition?

Which of the following is the most acidic?