Which one is a tracheate group

Which one is correct group reagent for group cations?

Which one is correct group reagent for group cations?

Which one is an oxide of group 2 metal?

Which one is not a blood group?

Which one is a primary alcoholic group ?

Which one is the seniormost functional group in the nomenclature of an organic compound if it possesses more than one functional group ?

Which one is a non-metal in group 13 ?

Which one is a non-metal in group 13 ?

Which one is a non-metal in group 13 ?