Can somebody please answer this question

Question

Classify the following organic structures by using theses words below

1. Aldehyde
2. Alcohol
3. Amine
4. Amide
5. Carboxylic acid
6. Ketone
7. Ether
8. Ester
9. Alkane
10. Alkene
11. Alkyne
12. aromatic ·        

CH₃COCH₃

CH₂CH₂CHCH₂CH₃

CH₃CONH₂ 

CH₃CH(OH)CH₂CH₃ 

Answer 1

1) Looks like a propane chain (3 carbons in a "line") except the middle carbon has a double-bonded oxygen

This means it falls into the Ketone group (R - (C=O) - R'), it has "any" type of a carbon chain on either side of the carbon double bonded to that oxygen, even if that "chain" is 1 carbon long

This compound is named Acetone

∴ #1 is best described under the Ketone group

2) This was the most challenging for me personally because it has been a while since I've done Organic Chemistry in my college studies but the only way I've found to make the two CH₂'s work with the single CH followed by the CH₂ - CH₃ is if you have the compound ethylcyclopropane

It is a triangle of carbons (typically equilateral triangle) with an ethyl group (a chain of 2 carbons) off of a point of the triangle (doesn't matter where because you could make any arrangement look like another by rotating around any axis)

And because nothing other than carbons and hydrogens are in this chain with only single bonds

∴ #2 is best described under the Alkane group

3) Nearly identical to #1; however, instead of the methyl group on the side of the C=O, it is an amine group (-NH₂)

Due to the C=O and the -NH₂, this compound named Acetamide

∴ #3 is best described under the Amide group

4) It seems the easiest was saved for last but this is a butane chain with an alcohol group off of the 2nd carbon in the chain (named 2-butanol)

∴ #4 is best described under the Alcohol group

I hope this helps! Please message me in the comments if you have any questions, comments, or concerns about any of the above!