Explain the following:
i) E2 elimination does not give rearranged product.
ii) E1 elimination does not involve isotope effect;
iii) Hofmann elimination gives less substituted alkene
iv) An anti elimination is faster than syn-elimination.
v) The elimination of HCl from chlorofumaric acid is 50 times faster than
chloromalic acid.
i) Typical mechanism for halogen alkanes. Elimination of H and halogen occur in one time, as result carbocation or carboanion is not formed and product of rearrange is not formed also.
ii) Carbocation is formed in time of
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Write the product and indicate the type of reaction that is taking place in the following:
Using FMO method explain why [1,3] sigmatropic rearrangement of protons in
alkenyl chain does not occur.
Arrange the following in the increasing order of electrophilic substitution. Justify your answer.
How would you prepare cis and trans alkene from alkyne? Give its mechanism.
Draw and explain potential energy diagram for the reaction of addition of HCl to 1, 3- butadiene at a low and high temperatures.
In Wittig reaction, the methyl, primary and secondary alkyl halide can be used to
prepare Wittig reagent (ylide) but not tertiary alkyl halide.
Write the full reaction and mark the nucleophile and electrophile in each case.
i) Reaction between potassium cyanide and 1-chloropropane
ii) Reaction between hydrogen bromide and cis 2-butene
iii) Reaction between sodium methoxide and benzyl bromide
iv) Acid catalysed reaction of water with cyclopentene
v) Reaction between ethanal and hydrogen cyanide