How many sets of inequivalent protons are there in the following compounds? 1.4-

Question

How many sets of inequivalent protons are there in the following compounds? 1.4-dichlorobenzene 1-butenedibroraoethane 1, 2-dibroraopropane a.1 b.2 c.3 d.4 e. none of the above a.1 b.2 c.3 d.4 e. none of the above a.1 b.2 c.3 d.4 e. none of the above a.1 b.2 c.3 d.4 e. none of the above What is the splitting pattern (i.e., doublet, triplet, doublet of doublet, etc.) of the indicated underlined bold proton? a. singlet b. doublet c. triplet d. quartet e. none of the above a. singlet b. doublet c. triplet d. quartet e. none of the above a. singlet b. doublet c. triplet d. quartet e. none of the above a. singlet b. doublet c. triplet d. quartet e. none of the above The IR spectrum is consistent with alkene alkyne alcohol ketone carboxylic acid

Explanation / Answer

1. one set of inequivalenr protons. each proton has one other and one meta chloride group.

2.e : none of the above. The compound has 5 sets of inequivalent protons. Two protons attached to double bond are not equivalent.

3.a. only one set of inequivalent proton.

4.c three. protons attached to three carbon atom of 1,2 dibromopropane are inequivalent.

The splitting of NMR signal folllows a n+1 rule where n is the number of inequivalent proton attached to the carbon adjacent to the protons underconsideration.

47. Number of in equivalent protons in the adjacent carbon = 3. signal is 3+1 = 4 i.e. quatrate

48.b doublet

49.doublet

50.doublet

The IR spectra is consistent with a ketone due to the presence of strong peak near 1700 cm^-1

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