Draw the relative energies of the molecular orbitals of the planar cyclooctatetraenyl dication shown below. Indicate in which MO's the electrons are located and predict its stability:

The degree of unsaturation, or index of hydrogen deficiency, is the number of pi bonds plus rings in a molecule. Specify the degree of unsaturation (index of hydrogen deficiency) of the following formulas: (a) C9H12 (b) C,H40| (c) C,H,N2

Do all of the atoms in buta-1,3-diene haveto reside in the same plane? Why or whynot?

Set up and solve the secular determinants for (a) cyclobutadiene in the Hückel p-electron scheme (considering a single p orbital on each carbon); find and order the energy levels and molecular orbitals, and estimate the delocalization energy

Draw the structures of 1,3-pentadiene and 1,4-pentadiene and label the carbons. Predict the trendin C-C single bond lengths in the two compounds.

(1R)-1-chloro-1-cyclohexylpropan-1-ol Draw the bond-line structure of the said compound

The degree of unsaturation, or index of hydrogen deficiency, is the number of pi bonds plus rings in a molecule. Specify the degree of unsaturation (index of hydrogen deficiency) of the following formulas: (a) C24H30 (b) C15H22 (c) C,H¡Cl,N

or each of the following molecules, construct the MOS from the 2p, atomic orbitals perpendicular to the plane of the carbon atoms. (a) Cyclobutadiene HC=CH НС—СН HC=CH НС —СH (b) Allyl radical H H H H C=C •C-C, H C-H H C-H H H Indicate which, if any, of these orbitals have identical ener- gies from symmetry considerations. Show the number of electrons occupying each w MO in the ground state, and indicate whether either or both of the molecules are para- magnetic. Assume that the C atoms in the allyl radical are all sp? hybridized. Activate io to S

Which of the following represents the lowest energy pi molecular orbital for cyclopentadiene?

Which of the following bond-line structures corresponds to the Newman projection shown? Br J... (A) Br I H. Br "Ω (B) CH3 CH3 CI H Br (C) Br CI (D)