Determine the relationship between Structure A and Structure B in each row of the table. H. Structure A Structure B Relationship O isomers HHHH HHHH C. C H C C H H O resonance structures H H :0- H H H H neither H H H-N=C=N-C-H + H-C-C-N=N: H H H O isomers O resonance structures neither O isomers :S-C=N: :N=C―S: O resonance structures neither

O REPRESENTATIONS OF ORGANIC MOLECULES Identifying isomers and resonance structures Determine the relationship between Structure A and Structure B in each row of the table. Structure B Relationship Structure A isomers H :NEN H. H-C C -NEN: H-C-C H. O resonance structures н н H O neither o isomers :o: H H H -C-H -H O resonance structures H o neither o isomers :o: H H O resonance structures H. `H. H H. H. o neither P Type here to search DE

Lewis structures of mescaline, a hallucinogenic compound in peyote cactus, and dopamine, a neurotransmitter in the mammalian brain, appear below. Suggest a reason for mescaline’s ability to disrupt nerve impulses.

Lewis structure name of highlighted group H – C= O Н — С — Н н — N — н H Н — С — Н O =C - N H H н н н —N C C= - H :0: :0 : : Z - I - :0:

8. Which structure is the best resonance structure for the acetate ion shown here? H H :0 H-Ç-C- H H :ö: H b) H-C=C- ö-ö-5-5-H (e H H :ö-H H :ö: c) H-C--ö: d) H-C-c=0: H H

Determine the relationship between Structure A and Structure B in each row of the table. Structure A Structure B Relationship O isomers H H H H Н-С— -C-NEN: N=N= C-C- H O resonance structures H. H O neither :z:

Single Bonds Multiple Bonds H-H 432 N-H 391 149 c=C 614 H-F 565 N-N 160 |-CI 208 C=C 839 H-CI 175 427 363 495 745 1072 N-F 272 -Br 0-0 H-Br N-CI 200 C-0* H-I 295 N-Br 243 S-H 347 C=0 N-O 201 S-F 327 N-0 607 S-CI S-Br 253 218 C-H 413 O-H 467 N=N 418 347 305 358 C-C 0-0 146 N=N 941 C-N O-F 190 S-S 266 C=N 891 0-CI 203 c=N 615 3. Given the table of bond dissociation energies above (in kJ/mol), estimate the energy change for the following reaction. + 2 F2 → 4 HF + N2

Calculate the formal charge of carbon in the compound H H. H H H. -1 O none of the above

Lewis structure name of highlighted group H – C= O Н — С — Н Н — N— н 0=C-C EN: H H H :N=C- C N– H H ? :0 : |

Which of the following contributing resonance structures is more important in the two examples below? Example 1 HC H H CIC H H H3C- :0: More important resonance structure = Example 2 •O -CH3 -NH₂ More important resonance structure = HC H H C=C H •0° :0: H₂C_C_NH₂ -CH3