Shown above is the l^H NMR spectrum of a compound with the formula C_5H_10O_2. C

Question

Shown above is the l^H NMR spectrum of a compound with the formula C_5H_10O_2. Choose from the constitutional isomers below to assign a structure to this spectrum (Choose the letter corresponding to the correct structure from the drop-down list provided.) Correct Structure Assign signal number 5 (indicated as a red number on the spectrum above) to its corresponding hydrogen(s) (shown as a red lower case letter on the structure above) (Write the letter of the hydrogen (or set of equivalent hydrogens) in the box provided, e.g., a) Signal number 5 corresponds to hydrogen(s):

Explanation / Answer

Answer – We are given the 1HNMR spectra and 3 compounds A, B and C. In the spectra there are 5 set of protons showing and in A there are 5 set of proton, for B there are 4 set of proton and for the C there are four set of protons.

In the B and C there are no any peak for 1H and the 1H peak number 1 is at 11.00 ppm, so this is for carboxylic acid only, so from the above data there is confirmed the given 1HNMR spectra for the compound A, since the compound A contains the 5 set of protons and there is also carboxylic acid proton.

Correct structure - A

We are given the signal number 5 for the 3H and it gives triplet and in each compound A, B and C there is proton set a hydrogens show the triplet for 3H, so

Signal number 5 corresponding to hydrogens – a

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