please help with all 4 ! thank you!

POLA Select the functional group that is present in the following molecule (select best answer). Linear Alkane Branched Alkane O Cyclic Alkane Alkene Alkyne Aromatic Alkyl Halide Alcohol Thiol O O O O Aldehyde o Ketone Ether O Carboxylic Acid O Ester O Acid Chloride Amine Amide Nitrile Submit Request Answer Select the functional group that is present in the following molecule (select best answe Linear Alkane Branched Alkane Cyclic Alkane Alkene Alkyne Aromatic Alkyl Halide Alcohol O Thiol O Aldehyde Ketone Ether Carboxylic Acid Ester Acid Chloride Amine Amide Nitrile Submit Request Answer Select the functional group that is present in the following molecule (select bes Linear Alkane Branched Alkane O Cyclic Alkane O Alkene O Alkyne O Aromatic O Alkyl Halide O Alcohol O Thiol O Aldehyde O Ketone O Ether O Carboxylic Acid O Ester O Acid Chloride O Amine O Amide O Nitrile Submit Request Answer Select the functional groups that are present in the following molecule OH . B Alkene Alkyne Aromatic Alkyl Halide Alcohol Thiol Aldehyde Ketone Ether Carboxylic Acid Ester Acid Chloride Amine O Amide Nitrile Submit Request