Concept explainers
(a)
Interpretation:
The contributing structures for furan have to be drawn.
Concept Introduction:
Contributing structures:
The double bonds of an
(b)
Interpretation:
The contributing structures for pyridine have to be drawn.
Concept Introduction:
Contributing structures:
The double bonds of an aromatic compound shift back and forth very rapidly which is known as delocalization. The resulted forms or structures cannot be separated and stay in equilibrium with charge separation. Those structures are known as contributing structuresof that compound.
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Chapter 21 Solutions
Organic Chemistry
- (b) NABH, CH3 COCH,CH3 CH3CH2OH (c)arrow_forwardTRUE OR FALSE (a) Both ethylene and acetylene are planar molecules. (b) An alkene in which each carbon of the double bond has two different groups bonded to it will show cis-trans isomerism. (c) Cis-trans isomers have the same molecular formula but a different connectivity of their atoms. (d) Cis-2-butene and trans -2-butene can be interconverted by rotation about the carbon–carbon double bond. (e) Cis-trans isomerism is possible only among appropriately substituted alkenes. (f) Both 2-hexene and 3-hexene can exist as pairs of cis-trans isomers. (g) Cyclohexene can exist as a pair of cis-trans isomers. (h) 1-Chloropropene can exist as a pair of cis-trans isomers.arrow_forward17) Synthesize: From: OH And any other compound with 1 or less carbon atomsarrow_forward
- (a) Draw a skeletal structure of the anabolic steroid 4-androstene-3,17-dione, also called "andro," from the following description. Andro contains the tetracyclic steroid skeieton with carbonyl groups at C3 and C17, a double bond between C4 and C5, and methyl groups bonded to C10 and C13. (b) Add wedges and dashes for all stereogenic centers with the following information: the configuration at C10 is R, the configuration at C13 is S, and all substituents at ring fusions are trans to each other.arrow_forwardConsider the tricyclic structure A. (a) Label each substituent on the rings as axial or equatorial. (b) Draw a skeletal structure for A, using wedges and dashes to show whether the substituents are located above or below the rings.arrow_forwardCircle and name the functional groups:arrow_forward
- Calculate the enthalpy of formation of propane from:a. Combustion data (ΔHc = –2217 kJ mol–1; ΔHf (CO2) = –393.4 kJ mol–1, ΔHf (H2O) =–285.2 kJ mol–1);b. Bond enthalpies (C–C 348 kJ mol–1; C–H 413 kJ mol–1; H–H 436 kJ mol–1; ΔHvap forcarbon = –717 kJ mol–1).arrow_forwardIdentify the different functional groups in the following molecules using names from the table below. (If there are fewer than 3 different functional groups, leave an appropriate number of answer boxes empty.) a) b) HO Name Alkene Arene Alkyne -c=c- Halide Alcohol Ether Amine Structures of Some Common Functional Groups Structure Nitrile X (X=F, Cl, Br, I) OH -C=N; Nitro Thiol Aldehyde Ketone Name Carboxylic Acid Ester Amide Carboxylic Acid Chloride Structure SH X Yo 0=ú 010 0=Uarrow_forwardDraw the structures for (a) 2-methyl-1,3,5-hexatriene and (b) 1,6-dimethoxyhexa-1,5-diene.arrow_forward
- Draw the structure of an alkane with molecular formula C7H16 that contains (a) one 4° carbon; (b) only 1° and 2° carbons; (c) 1°, 2°, and 3° hydrogens.arrow_forwardSolve 6,7arrow_forwardDraw structures that t each description and name the functional group in each molecule: (a) two constitutional isomers with molecular formula C5H10O that contain different functional groups; (b) two constitutional isomers with molecular formula C6H10O that contain the same functional group.arrow_forward
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