We're supposed to try and figure out the structure of a compound based off the the following information:

δ: 2.4 2H triplet

δ: 2.1 3H singlet

δ: 1.5 2H triplet

δ: 1.3 6H singlet

δ: 0.9 3H triplet

>δ: 2.4 2H triplet
This is probably a CH2 group bonded to a carbonyl, which is suggested by the chemical shift, and another CH2.

>δ: 2.1 3H singlet
This is probably a CH3 group bonded to a carbonyl group, which is indicated by both the chemical shift and the fact that it is bonded to another carbon that has no hydrogens.

> δ: 1.5 2H triplet
I was thinking that this is CH2 next to another CH2 and .. maybe a carbonyl group or a t-butyl group? Or possibly next to two CH groups?

>δ: 1.3 6H singlet
This is the one that stumps me the most. Usually, when I see a chemical shift of 1.3 with 6H, my first guess is isopropyl, but the fact that it's a singlet is really throwing me off.

>δ: 0.9 3H triplet
This is almost certainly a CH3 group bonded to a CH2.

On the IR Graph, the information given is as follows:

2960 cm^-1: Transmission 72%

1714 cm^-1: Transmission 45%

The first IR reading indicates an alkane, while the second indicates a ketone.

That's about as far as I've gotten. Help please! D:

Based on the provided information, let's analyze each chemical shift and IR reading to determine the structure of the compound.

1. δ: 2.4 2H triplet:
This chemical shift is indicative of a CH2 group, which is bonded to a carbonyl group. The triplet pattern suggests that it is adjacent to two other CH2 groups. Therefore, we can infer the presence of a ketone group (C=O) and two additional CH2 groups.

2. δ: 2.1 3H singlet:
This chemical shift corresponds to a CH3 group that is bonded to the carbonyl carbon. The singlet pattern suggests that it is not coupled to any nearby hydrogens. Therefore, we can conclude that this is a methyl group attached to the carbonyl carbon.

3. δ: 1.5 2H triplet:
This chemical shift indicates two CH2 groups. However, the exact functional group cannot be determined solely based on this information. It could be next to a carbonyl group or a t-butyl group, or it could be surrounded by other CH groups. We need additional information to narrow down the possibilities.

4. δ: 1.3 6H singlet:
This chemical shift is lower than typical isopropyl groups and suggests a different functional group. The presence of six hydrogens indicates the possibility of an aromatic ring or a saturated alkyl chain. However, the singlet pattern is unusual for either of these possibilities. To identify this group, we need more information.

5. δ: 0.9 3H triplet:
This chemical shift corresponds to a CH3 group that is attached to a CH2 group. The triplet pattern implies coupling to the nearby hydrogens. Therefore, we can infer the presence of a methyl group connected to a methylene group.

Regarding the IR readings:

1. 2960 cm^-1, Transmission 72%:
This absorption indicates the presence of C-H bonds in the compound. The relatively high transmission percentage suggests that the compound is not highly alkyl-substituted.

2. 1714 cm^-1, Transmission 45%:
This absorption is characteristic of the C=O stretching vibration in a ketone functional group. The lower transmission percentage suggests a moderate degree of substitution.

In summary, based on the given information, we can tentatively propose that the compound has the following structure:

Ketone (C=O)
|
CH2-CH2-CH2-CH(CH3)-CH3

Further analysis or additional data may be required to confirm this structure accurately.