Which the following is an example of an organic compound that contains an attached carbonyl group at the end of a carbon chain?
ketone
aldehyde
ether
amine

Most likely the organic compound that contains a carbonyl group bonded near to the end of the chain would be an aldehyde. Unlike a ketone where the carbonyl can be found anywhere within the chain, an aldehyde, is specifically found near the end of the compound, because it would be bonded to H as well.

Answer : The correct option is, Aldehyde.

Explanation :

Ketone group : It is the class of organic compound in which the group is attached to a hydrocarbon is known as ketone.

The general representation of ketone are, .

For example : Acetone,

Aldehyde group : It is the class of organic compound in which the group is attached to a hydrocarbon is known as aldehyde.

The general representation of aldehyde are, .

For example : Ethanal ,

Ether group : It is the class of organic compound in which the oxygen is directly attached to the two alkyl group of carbon is known as ether.

The general representation of ether are, .

For example : Dimethyl ether,

Amine group : It is the class of organic compound in which the group is directly attached to the alkyl group of carbon is known as amine.

The general representation of amine are, .

For example : Ethylamine,

As per question, aldehyde is an example of an organic compound that contains an attached carbonyl group at the end of the carbon chain.

Hence, the correct option is, Aldehyde.

I think the most appropriate answer is: the solvent being used in the experiment
To correct for any light absorption not originating from the solute you will need to calibrate the tools with a solution that most similar to the sample.
Blank covete or standard solution can be used, but it was not ideal. By using the solvent as calibration, you can remove the reading from the solvent so your result only comes from the sample.