The number of mono-bromination products of p-xylene is
Which of the following compounds has the lowest boiling point?
d. all boiling points are the same
The carbanion of cyclopentadiene would be classified as
d. none of the above
Consider the possible isomers of chlorotoluene. Which of the possibilities will result in only two types of aromatic protons by NMR?
d. all of the above
In the mass spectrum of butylbenzene, the base peak occurs at m/z
The molecular mass of butylbenzene is 134; therefore, we might surmise that 134 is the base peak. Let's look at the possible fragmentation pattern of butylbenzene. The place where it would be expected to fragment easiest would be at the junction between the benzene ring and the n-butyl group. If it fragments there, what would be those m/z peaks? The C6H5 group would be at 77 and the butyl group would be 57, neither of which appears as an option in the multiple choice question. Therefore, we would surmise that 134, the molecular ion peak is probably the base peak as well. Remember, base peak is the tallest peak.
In fact 119 is the peak resulting from loss of a methyl group, hardly likely to be the main peak. The 105 peak results from loss of ethyl group, hardly like to occur readily. And the 91 peak is the one resulting from loss of propyl group, again, hardly likely.
This solution identifies the correct answer to the question set, accompanied with full explanations and structural forms.
Solving organic chemistry problems
Please see the attached.
Methylene diphenyl di-isocyanate (MDI) is used as an adhesive ----- it is often cross-linked with maleic anhydride when in the presence of water.
We are asked to explain and detail out the structural components of this reaction.
I have a theory 1A and theory 1B ----- my guess is that the maleic anhydride hydrolizes in water to create maleic acid. Then I think one of 2 things happens: a) the maleic acid attacks the CH2 functional group in the diagram attached......or b), it attacks the more reactive isocyanate (NCO) functional group in the diagram attached.
Can sometime please take a stab at this reaction ---- so I need an explanation and then a diagram of the by-product reaction! I really need your help!View Full Posting Details