5. When 13-butadiene reacts with HCl, two products form: 3-chloro-1-butene and 1
ID: 1066825 • Letter: 5
Question
5. When 13-butadiene reacts with HCl, two products form: 3-chloro-1-butene and 1-chloro-2-butene. At low temperatures (-78 C), which of the following statements is correct? A) Thermodynamic control favors formation of 3-chloro-1-butene. B) Kinetic control favors formation of 3-chloro-1-butene. cyThermodynamic control favors formation of 1-chloro-2-butene. Kinetic control favors formation of 1-chloro-2-butene. 6. Which statement regarding Hockel's rule is FALSE? B) The molecule must be planar. C) The molecule must be cyclic. D Each of the pi(t) electrons must be associated with a conjugated double bond. 1. Whatis the electrophile in the electrophilic substitution reaction of acetyl chloride (CHCOC) and AICl reacting with benzene? By AlCl A Cl C) CHC D) CEO 8. Which of the following alcohols would you expect to be the strongest acid? A) ClycoHExplanation / Answer
5. At -78 degree kinetcally favored (through Markonikov rule) product 3-chloro butene-1. At low temperature, the low activation energy (minimum energy required to posses by reactants to undergo reaction) accounts for kinetically controlled product.
6. For a molecule to be Aromatic
It must be cyclic, planer, conjugated and having a delocalized cloud of 4n+2pi electrons.
Pi electron delocalization is must (not conjugation of double bond). e.g. In cyclopentadienyl anion, two electrons of -ve charge also get involved in delocalization.
Therefore, option (D) is wrong.
7. Electrophile is elecron loving i.e electron deficient species.
In this case acetyl cation (option C) formed by reaction b/w AlCl3 and acetyl chloride is electrophile. It reacts with benzene and forms acetophenonr.
8.Bronsted said any proton H+ giving species is an acid.
Among given options, one releasing H+ easily is strongest acid. Due to high electronegativety (-I effect) of chlorine (three in number) option (A) is strongest acid.
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