(a)
Interpretation:
The aromatic cyclopolyenes that are neutral are to be predicted.
Concept introduction:
A molecule must be cyclic, planar, completely conjugated and should follow Hückel’s rule to be classified as aromatic. According to the Hückel’s rule, the number of
(b)
Interpretation:
The aromatic cyclopolyenes that have single negative charge are to be predicted.
Concept introduction:
A molecule must be cyclic, planar, completely conjugated and should follow Hückel’s rule to be classified as aromatic. According to the Hückel’s rule, the number of
(c)
Interpretation:
The aromatic cyclopolyenes that have double negative charge are to be predicted.
Concept introduction:
A molecule must be cyclic, planar, completely conjugated and should follow Hückel’s rule to be classified as aromatic. According to the Hückel’s rule, the number of
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EBK PHYSICAL CHEMISTRY
- Which of these is not aromatic? (A) (B) (C) (D) CH CHarrow_forward(a) The heat of combustion of ethyne, carbon, and hydrogen gas are -1300 kJ/mol, - 394 kJ/mol and -286 kJ/mol respectively. By manipulating the information given, calculate the enthalpy of formation of ethyne from the reaction between carbon and hydrogen gas.arrow_forwardWhich of the following structures are aromatic? CH2 I II II IV (a) I and II (b) III and IV (c) only I (d) І, II and IVarrow_forward
- Evaluate each of the following processes applied to cyclooctatetraene, and decide whether the species formed is aromatic or not. (a) Addition of one more π electron, to give C8H8− (b) Addition of two more π electrons, to give C8H82− (c) Removal of one π electron, to give C8H8+ (d) Removal of two π electrons, to give C8H82+arrow_forwardProvide the bond-line structure of (Z)-4,5-dichloro-2-pentene.arrow_forward(b) (1-chloromethyl)cyclopentane, C6H11CI reacts with aqueous sodium hydroxide, NaOH to produce a primary alcohol AA. When CsH11Cl is added with magnesium, Mg in ether, an organometallic compound BB is formed. When compound BB reacts with ethanal, CH3CHO, a secondary alcohol cC is formed. The molecular structure of C6H11CI is given below. (1-klorometil)siklopentana, C6H11CI bertindak balas dengan akues natrium hidroksida, NaOH bagi menghasilkan satu alkohol primer AA. Apabila C6H11CI ditambah dengan magnesium, Mg dalam eter, sebatian organologam BB terbentuk. Apabila sebatian BB bertindak balas dengan etanal, CH3CHO, satu alkohol sekunder CC dihasilkan. Struktur molekul bagi C6H11CI diberikan di bawah. (1-chloromethyl)cyclopentanearrow_forward
- Please don't provide handwritten solution ...arrow_forwardThe skeletal line formula for a branched alkene is shown below. (i) What is the molecular formula of this compound? (ii) How many carbon atoms are in the longest chain, ignoring the double bond? (iii) What is the longest chain incorporating both carbons of the double bond? (iv) How many substituents are on this chain? (v) Give the IUPAC name for this compound. [6]arrow_forward(1) Predict the outcome of the addition of HBr to (a) trans-2-pentene, (b) 2-methyl-2-butene, and (c) 4-methylcyclohexene. How many isomers can be formed in each case?arrow_forward
- 4 Determine how many carbon environments each of the following molecules posess.arrow_forwardWrite structural formulas for all the constitutionally isomeric compounds having the given molecular formula.(a) C4H10(b) C5H12(c) C2H4Cl2(d) C4H9Br(e) C3H9Narrow_forwardCalculate 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_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning