An unknown compound X has the empirical formula C3H6O and a molecular ion peak in its mass spectrum at m/z 116. X shows no IR absorption at 3200-3600 cm^-1 but shows a peak at 1740 cm^-1. The H NMR spectral data of X is shown below. What is the most likely structure of X? 22. An unknown compound X has the molecular formula C6H14O. X shows a strong peak in its IR spectrum at 3000 cm^-1. The 1H NMR spectral data of N are given below. What is the most likely structure of X? Absorption ζ H ratio
triplet 1.0 3
double 1.0 6
quartet 2.0 2
septet 3.5 1

Explanation:

For an unknown compound whose empirical formula is C3H6O, the atomic no= 58, and since mass spectrum possesses a molecular ion at 116, then the twice amount of the empirical formula is called the molecular formula.

The degree of unsaturation pf C6H12O2 = 6 - (12/2) + 1

= 6 - 6 + 1

= 1 double bond or ring

Similarly, the IR shows a peak at 1740 cm⁻¹. This showcases the presence of a carbonyl group

Following the 1 HNMR data;

At 1.0 ppm, triplet 3H --> a methyl group is next to a CH2

At 1.2 ppm, doublet, 6H --> two methyl groups are next to a CH(isopropyl group)

At 2.0 ppm, quartet 2H --> CH2 next to the methyl group at 1.0 ppm

At 3.5 ppm, septet 1H  --> CH group of the isopropyl group

The presence of the two oxygen also gives a hint that the structure seems to be an ester called isopropyl propionate.

hi,

the answer is d.indefinite shape but definite volume, let go oogle u out

hope this !

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.