D) Meta allu uLaull directing 12. Predict the major product of the following rea
ID: 1066836 • Letter: D
Question
D) Meta allu uLaull directing 12. Predict the major product of the following reaction. Ph 1. LiAND Ph OCH, 2. H20 13. Which of the following would you expect to absorb longest wavelength in UV spectroscopy? B) A) 14. What is the first step of the mechanism for the conversion of ethanol into bromoethane using PBr? A) Bromide ion attacks the alcoholic carbon, displacing OH B) The alcohol hydroxide group leaves, forming a carbocation. The alcohol oxygen attacks phosphorus, driving out bromide ion. One PBry bromine attacks the hydroxyl hydrogen. None of the above. 15. Which of the labelled hydrogens is the most acidic? HA HR HC OH E) HE HA B) HB C) Hc D) HDExplanation / Answer
12) option E is correct ( Reduction of ester with LiAlH4 produces an alcohol as major product.)
13) option C is correct (Increase in conjugation increases the Uv absorption. option C has isolated double bonds so it has less absorption.)
14) option C is correct. ( The lone pair of electorns on oxygen atom of alcohol attacks the phosphorous atom and eliminated bromide ion and forms a good leaving group.)
15) Hc is the most acidic proton because the negative produced after removal of proton is in conjugation with the carbonyl group. So it is more acidic.)
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