In which type of pericyclic reaction is a bond broken and a new ...

[RRMR]

In which type of pericyclic reaction is a  bond broken and a new  bond formed?
 a. cycloaddition
  b. photochemical electrocyclic
  c. thermal electrocyclic
  d. sigmatropic rearrangement.
  e. all of the above

Question 2

For an odd number of electron pairs (double bonds), for cycloadditions reactions which of the following rules is correct?:
 a. thermal conditions - antarafacial, photochemical conditions - suprafacial
  b. thermal conditions - suprafacial, photochemical conditions - antarafacial

[huda]

Answer to Question 1

d

Answer to Question 2

b

[RRMR]

Thank you!

[huda]

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