Increasing priority of functional groups

Question 1

1st class

Answer 1

Carboxylic acid
- carboxy
- oic acid
Ester
- alkoxy carbonyl
- yl oate
Amide
- amido
Nitrile
- cyano
Aldehyde
- oxo

Question 2

2nd class

Answer 2

Aldehyde
Ketone
- oxo
Alcohol
-hydroxy
Amine
-amino
Alkene
- alkenyl

Question 3

3rd class

Answer 3

Akyne
- alkynyl
Alkane
- alkyl
Ether
- alkoxy
Alkyl Halide
- halo