4. Omit the questions on p. 10-3 of the 262 lab manual. Answer the following questions...

4. Omit the questions on p. 10-3 of the 262 lab manual. Answer the following questions instead.
a) A research paper describes that a photochemical reaction takes place in a quartz vessel but not in a Pyrex vessel. Rationalize this observation.
b) Why does the benzopinacol precipitate from the reaction mixture even though it is a diol?
c) What is the purpose of washing with 95% ethanol?
d) The acid-catalyzed rearrangement of benzopinacol to benzopinacolone is irreversible. Explain.

Expert Solution

a ) The photochemical light having shorter wawelenght ( < 200 cm^-1) have a high energy sufficient to breck covalent bonds.If we use pyrex vessel it cannot withstand to such aa energy & will be brocken down.For the stability of pyrex vessel the waveleght required is above 200 cm^-1 .The quartz vessel is stable to such photochemicals energy & therefore used in photochemical reaction.

b ) the light is absorbed & passed through pinacolon mixture without initiating the reaction & hence the measurable conversion is less & therefore precipitated out.

c ) The most of the impurities in the precipitates are dissolved in 95 % ethanol & we get pure precipitates.

d) The protonation of hydroxyl group by acid makes leaving group & expel oit as water. The one of the phenyl group is the transfered to electron deficient carbon atom makinf C-O double bond.& hence reaction is irreversible.

queen_honey_blossom answered 2 months ago

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