AAMC Test 3 questions with complete solution 2023 verified

AAMC Test 3 questions with complete solution 2023 verifiedFor a thermodynamic mixture of isomeric products - correct answer the relative mole ratio of products is directly related to the relative stability of these products #2. What can be inferred from the results of scheme A about the relative thermodynamic stabilities of Compounds 4a and 4b A. Compound 4a is less stable than Compound 4b. B. They are equally stable. C. Nothing can be inferred about relative thermodynamic stabilities. D. Compound 4a is more stable than Compound 4b. - correct answer Compound 4a is more stable than 4b The image shows that 4a is produced 60% and 4b 40%. --So 4a will be more stable among the two thermodynamic products #3. Which of the following compounds is most likely to be a major product in step 2 if the aldol condensation is NOT followed by a dehydration reaction? - correct answer Ans in image --coz if there is no dehydration, then the OH would be present instead of the double bond #4. Compound X is shown below.(image) If compound 2 is replaced with compound X, what will be the structure of the final product in steps 1 and 2? (Note: assume that the yields of steps 1 and 2 are not affected by substitution) - correct answer Ans in image --coz this is the product of Michael addition followed by intramolecular aldol condensation (Robinson annulation) #5. What is the total amount of charge and energy, respectively, that the capacitor will store if it is connected to the battery on the railcar? - correct answer 1.20C and 7.20J C=Q/V Energy stored by a capacitor = Ue = (1//2)CV^2 = (1/2)QV = (1/2)Q^2V Given V= 12V C = 100 x 10^-3 F Q = VC = (12)(100 x 10^-3) = 1.20 C Ue = (1/2)QV = (1/2)(1.20)(12) = 7.20J #6. Suppose that the railcar passes by a horn that is emitting a sound with a frequency f. Which of the following describes f' that the person on the railcar hears? - correct answer f' f before passing the horn, f' f after passing it Due to doppler effect, the frequency that the person on the railcar hears before passing the horn is larger than the actual frequency of the sound emitted, while the person hears a frequency lower than the actual frequency after passing the horn --Before passing the horn, the object(rail car) is coming closer to the source (horn) so f'f --After passing the horn, the object(railcar) is moving away from the source (horn) so ff' Doppler effect - correct answer The apparent frequency (f') of the source is increased as the source approaches the observer, and is decreased as the sources leaves the observer