Question

A. Double bonds that are connected by a single bond are said to be conjugated. For each molecule below, indicate how many conjugated double bonds are present in each molecule. HO OH bro HO B. One feature that distinguishes conjugated dienes from isolated dienes is that the C-C bond joining the two double bonds is unusually short. For each of the molecules in Part A, indicate which C-C single bond(s) might be shorter than expected. C. Some reactions of conjugated dienes are different from reactions of isolated double bonds. i) Draw the mechanism of the addition of HBr to 1-butene and give the product that is formed. ii) What factor most influences the formation of the final product? You might want to review Chapter 6 when answering this question. iii) Just as with isolated alkenes, electrophilic addition of HX occurs with conjugated dienes. Mechanistically, the reactions are the same. Often two products are formed, a 1,2 addition product and a 1,4 addition product.

Answer 1

Solution:

molecule to be # Conditions por . Conjugated. There should double or T → There should or non- planar two r- bonds be alternate o ode (Double bond Connected by single bond) - not be a sp3 carbon between As a alternate r bonds. Conjugated double I bonds=2 As all 3.ro bonds are altern - ate, Conjugated double I bonds=3 bood As all ar are not alternate or not separated by Single | Conjugate double bonds= 0 As all 3 r bonds are altern -ate bonds or separated by single bond. Conjugated double bonds

Ho IL Both two double bonds are not alternate, As there are two alternate double or r bond. Conjugated bonds=2 Conjugated bonds HO Three double bonds eldeal ble bondes el teol All 3 double 2 OB Carbonyl and bonds are alternate 1 Carton, double bond bonds. care alternate - | Conjugated double Conjugated bonds=3. double bonds=3

Conjugated double bonds has been founded for each molecule in first question.

As per Chegg's policy, I've solved only first question.

Hope, it helps. :)