Which of the following dienes is the most reactive in a normal Diels-Alder react

Question

Which of the following dienes is the most reactive in a normal Diels-Alder reaction? 6. A. B. C. 7. Which of the following is NOT required for a compound to be aromatic? A. 4n+2 electrons B. cyclic C. conjugation D. an anion 8. Which of the following reagents is typically used for bromination at a benzylic position? A. NBS and light B. HBr and FeBrs C. Brz and FeBrs D. HBr and light 9. The first step in a Suzuki coupling is called? A. Initiation B. Reductive Elimination C. Oxidative Addition D. Propagation 10. A reaction step that produces a new radical from an existing radical is called: A. Initiation B. Propagation C. Termination D. Kinetic

Explanation / Answer

6) for diels alder reaction diene must be in cis orientation of both double bonds.

So cyclopentadiene (option c) is more favorable.

option A and D also can react but slowly . Because they will be in equilibrium between Cis and Trans orientation and trans is more favor than Cis .

Therefore Answer is option c

7) For an aromatic compound it does not need to ba an anion, eg Benzene.

So answer option D) an anion.

8) Answer option A) NBS and light

It is selected reagent to brominate allylic and benzylic position,

9) Answer option C) oxidative addition.

oxidative addition of aromatic halide from Pd(0) to Pd(2+)

10) Answer option B) propagation.

from neutral molecule to radical ----> Intiation

one radical to another radical -----> propagation.

radical to neutral molecule ------> Termination.

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