Light or heat is required for which step in the halogenation of alkane?

What are the reagents required for the following reaction?

What is the major product for the following reaction?

What is the major product of the following reaction?

What are the reagents required for the following transformation?

Which one is the Markovnikov's Product of the HBr addition to the following compound?

What is the product of the Br₂ addition to methycyclohexene?

What is the structure of A?

What is the product of the following reaction?

What are the reagents required for the following transformation?

What is the structure of A?

What is the major product of the following reaction?

What is the major product for the following reaction?

Which enol is the major product of the following hydration reaction?

Which one is the keto tautomer of the following enol?

Which reagents are required for the following transformation?

What is the structure of A?

Which one is an enol?

Which structure has an enol-keto tautomer?

Which reagents are required for the following transformation?

Which one cannot be the structure of A?