l Sprint LTE 12:38 PM Recitation 6 (chapter 14).pdf Recitation 02/20/2018 (Chapt

Question

l Sprint LTE 12:38 PM Recitation 6 (chapter 14).pdf Recitation 02/20/2018 (Chapter 14) 1) Which of the following statements is false a. Bennene undergoes subetitution reactions canier than addition reactions. b. Ahernating C bonds in benene have different lengths c Bemnene does mot undergo Diels-Alder reactions d. Hydrogenation of bennene is extremely slow and requires extreme conditions e. The doule bonds in bennene are conjugated 2) which statenent about the molecular otitals in benzene is nie? a. All antibonding orbitals are occupied b. Not all the bonding orbitals are occupied e· There are no nonbonding orbitals. All the bonding orbitals have differem energies e. All the antibonding orbitals have difserent energies 3) The heat of hydrogenation of henzene is a. equal 3xthe le ifhyulupenation of ethylene. b. equal to 1.Sx the heal of hydrogenation of 1,3 buradiene. s, equal to 1.5 the heat of hydrogenation of 1.3-cyclobutaiene d lower than 3s the heat of hydogention of ethylene. e. higher than 3x the heat of rydgenation of ethyene Which of the following structures is aromatic 1 of 5 5) 6 Courses Calendar To Do Notifications Inbox

Explanation / Answer

1) b) false

all the bonds in benzene are of same length.

2) c) true.

3) d) it is less than 3 * the heat of hydrogenation of ethylene. it is beacause of the conjugation of double bonds which reduces the strength of the double bonds.

4) b) structure (i),(iii) and (iv) are aromatic. all have 3 pairs conjugate pi electrons and follow huckel's rule.

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