Identify the ketone among the following

Cyclobutane is an example of __________ compounds  

General molecular formula of alkynes is _______.

According to IUPAC rules, the secondary suffix used to represent carboxylic acids is
______.

The enzymes present in yeast is / are __________.

The organic compound contains 2carbon  atoms, the root word according IUPAC is

When ethanol reacts with acidified K₂Cr₂O₇ the orange color of K₂Cr2O₇ changes to-----------------
 

Methylene group is

Rectified spirit contains

Ethanol is used as __________.