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- 7. Consider the C=O stretching data for the following cyclic ketones: cyclopropane 1813 cm³¹; cyclobutanone 1791 cm³¹; cyclopentanone 1740 cm³¹. (a) which ketone has the strongest bond? (b) where in the trend would you expect the C=O stretch of cyclopropenone? (Use the hybridization information in the same way we used hybridization for C-H stretching.)7. Assign E or Z configuration to the following molecules: (A) (B) (C) (D) (E) I = Z; II = E I=E: II = Z I= E; II = E I=Z; II = Z I= E; II is neither E nor Z OH I II C1or 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
- Choose the correct option. 14.How many electrons are present in the nonbonding π molecular orbital of the allyl anion?A)0B)1C)2D)3E)4 15.Which of the following statements concerning electrocyclic reactions is correct?A)The ground state HOMO of a compound with an even number of conjugated double bonds is asymmetric.B)The allowed mode of ring closure under thermal conditions for a molecule containing an even number of conjugated double bonds is disrotatory.C)The allowed mode of ring closure under photochemical conditions for a molecule containing an odd number of conjugated double bonds is disrotatory.D)both B and CE)none of the above 16.Under thermal conditions,(2E,4Z)-hexadiene undergoes a ___ ring closure to yield ___.A)conrotatory,cis-3,4-dimethylcyclobuteneB)conrotatory,trans-3,4-dimethylcyclobuteneC)disrotatory,cis-3,4-dimethylcyclobuteneD)disrotatory,trans-3,4-dimethylcyclobutene 17.Under photochemical conditions,(2E,4Z)-hexadiene undergoes a ___ ring closure to yield…2. The full structural formulae of three organic compounds, P, Q and R, are shown below. H H H H HH HHHH Н-С -с- Н H-C- C - C = C – H H - C - C = C – C – H H H H H Q P (a) State one similarity between P, Q and R in terms of their molecular formulae. (b) Name the homologous series that compounds P, Q and R belong to. (c) State one similarity between Q and R in terms of chemical bonding id) Which of these compounds are isomers? Explain your answer.N2(g) deltaH(kj/mol)=0, deltaG(kj/mol)=0, S(J/mol K)=1891.6 H2(g) deltaH=0, deltaG=0, S=130.7 NH3(g) deltaH=-46.1, deltaG=-16.5, S=192.5
- J of Br G K OH Br H L OCH 3 of 1 M OH NH (i) Compound H is an example of what functional group? Select alternative (ii) Compound G is classified as a: Select alternative ✓. (iii) Which compound has all carbons sp2 hybridised? Select alternative ✓ (iv) Which two compounds in Table 1 are constitutional isomers? Select alternative (v) Which statement best describes the stereochemistry of compo G? Select alternative (vi) Which compound in Table 1 is the MOST polar? Select alternative (vii) What is the systematic (IUPAC) name of compound G? Select alternative (viii) Which compounds will have MORE than 4 signals in their 13C NMR spectra? Select alternative (ix) Which electrophile from Table 1 will react fastest in an SN1 reaction? Select alternative (x) How many constitutionally isomeric alkenes will be formed when compound L reacts with NaOH? Select alternative (xi) Which compound(s) from Table 1 can be used to form a Grignard reagent? Select alternative (xii) Which functional groups can be…Draw the structure of the one tertiary (3°) amine with molecular formula C5H13N that does not contain a 3-carbon chain. You do not have to consider stereochemistry. You do not have to explicitly draw H atoms“Spectroscopy” What types of electronic transitions are possible the following compound?
- In which orbital is the lone pair electron of pyrrole nitrogen present? (A) sp (B) sp (C) sp (D) p2. (a) Calculate the spin only magnetic moment of: 0= V O SO₂The absorption pattern in the UV/VIS region corresponds to (a) bond vibrations b) valance electron transitions =) molecular rotations E) nuclear spin 0000 a an IR spectrum