Which will produce the largest coupling constant? a. H_A coupling to H_B b. H_A
ID: 1020364 • Letter: W
Question
Which will produce the largest coupling constant? a. H_A coupling to H_B b. H_A coupling to H_C c. H_B coupling to H_C d. H_C coupling to H_D c. H_D coupling to H_E Which compound would produce the^1H NMR spectrum below? a. I b. II c. III d. IV e. V Which of the following compounds would you expect to react with a nucleophile at the highest rate? a. A b. B c. C d. D e. E Which of the following compounds would you expect to have the highest percent hydration at equilibrium a. A b. B c. C d. D e. EExplanation / Answer
Solution :-
Q19) :- The coupling between the trans hydrogens is more than cis hydrogens
Therefore the Ha – Hc hydrogens will have the largest coupling constant value.
Q10) The NMR spectrum shows the 4 peaks that means the compound have 4 different type of hydrogens in it
The peak at about 3.8 to 3.9 ppm is the characteristic peak for the OCH3 group and the peak at 2.5 ppm is for the peak for the alkyl group attached to the carbonyl group So it will be ketone
Peak at about the 7.1 ppm is the aromatic protons which are close to OCH3 group and the peak at about 7.8 ppm is the aromatic protons which are close to electron withdrawing ketone group
So the structure shown in the option I will produce the given peak
So the correct answer is option A.
Q21) When the compound is more electrophilic then it will react with nucleophile at faster rate so among the given structures the compound shown in the option c that is formaldehyde is most electrophilic because it do not have any alkyl group which can show the electron donating effect towards carbonyl
So the answer is option c. C
Q22) The compound shown in the option A is the ketone which have two alkyl groups attached to carbonyl so it can be hydrated more at equilibrium
So the answer is option A
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