:NH : ΝΗ +NH2 `NH2 NH3 H,Ñ NH2 Guanidine A В

(7) Heterolytic reactions involve   A) Bond-breaking where each of the fragments retains one of the originally bonded electrons B) Bond-breaking where one of the fragments retains both of the originally bonded electrons C) Bond-making where each of the fragments retains one of the originally bonded electrons D) Bond-making where one of the fragments retains both of the originally bonded electrons

An example of a conjugated system is two positively charged carbons separated by one single bond one negatively charged carbon adjacent to a л bond two negatively charged carbons separated by one single bond one positively charged carbon adjacent to a σ bond

Which do you expect to have a more intense and concentrated “hot spot” of negative charge: methoxide ion or bicarbonate ion? Explain.

Complete the following acid-base reaction . Show all valence electrons on the interacting atoms and show by the use of curved arrows the flow of electrons in each reaction.

Other than having 4n+ 2 pi electrons, which condition(s) must be met for a molecule to be aromatic? O The molecule must be planar. The molecule must be conjugated. O The molecule must be a ring. O All of the above.

6. The structure originally proposed for Cordycepic acid, [a] = + 40.3°, has been shown to be in correct, suggest reason to be skeptical about the original structure, which is given below. CO2H HO Not OH HO OH

For which of the following molecules are there two unique configurations about the double bond? Explain. (a) (CH3)2C=CHCI; (b) H2C=CHCH,CH3; (c) CIHC=CHBr; (d) HC=CCH=CHCI

Determine α' and α for a molecule that experiences a Debye bond energy of -2 aJ being at a distance of 0.1 nm from a molecule of acetic acid

The photo dimerization of benzophenone to benzopinacol is initiated by what type of electronic transition that then rapidly decomposes to a diradical since putting in electrons in anti bonds breaks bonds! The diradical then starts abstracting hydrogens from solution as pictured in the text? σ = electrons in sigma bonds n = electrons in non-bonding orbitals π electrons in pi bonds. anti bonds Hint: This process is very important because although the molecule responsible for human vision (retinal) is not a very long conjugated pi system, this transition allows retinal to absorb visible light. a. n to σ* b. σ to σ* C. π το π d. n to П e. σ to П* f. π to σ'