Question

1) In a normal Diels-Alder reaction, compound_ will react the fastest and will react the slowest. CN ANH, CN CN ndi" Ivana a) I and II b) I and III c) II and IV d) III and I e) IV and V 2) What is the major product of the following reaction? h CHO CHO 1 CHO *CHO "CHO CHO a) Cho b) Eris c) Criy d) Cho 3). Which of the following compounds is aromatic? d) None (a, b and c are not aromatic compounds) 4) What starting materials could be used to prepare the following compound? B

please answer all

Answer 1

Solution :

1) Option D (III and I)

The reactivity of dinophile increase with increasing the electron withdrawing groups and decrease with electron releasing groups.

2) The correct option is B.

The given reaction is an example of Diel's alder reaction. The stereochemistry is maintained in this reaction due to its concerted mechanism. The reaction is provided in the attached sheet.

3) Option A

The compound A is aromatic because it has six electrons in the ring (including lone pair of oxygen).

4) Option B

The reaction is provided below.

си, CHO Luo , 141 CHO InnCHO Coption B) (Diels-Alder reaction) reaction) cuz S (1) Aromatic (or electrons un sing) (option A) or - Ochi Caption e) (Diels. Alder reaction) CN