| C) | BH3 is trigonal planar and NH3 is trigonal pyramidal. | D) | BH3 is trigonal pyramidal and NH3 is trigonal planar. | 4. | Which one of the following is the conjugate acid of ethanol? | A) | CH3CH2O– | B) | CH3CH2O+ | C) | CH3CH2OH2+ | D) | CH3CH2OH3+ | 5.
Hydrogens on the alkene have different reactivity which determines which isomer is favored. Hydrogens attached to carbons, and have a weak bond strength are most reactive therefore are favored during abstraction by chlorine. The chloro substituent has an effect on carbon reactivity due to the chlorine atom being an electron withdrawing substituent. The chlorine
A. ethanoic acid B. ethyl ethanoate C. hexane D. hex-1-ene 8. A compound boils at –33oC. It also dissolves in water to give an alkaline solution. Which type of bonding is present within the compound? A. metallic B. covalent (polar) C. ionic D. covalent (non-polar) 9.
Structural lipids in membranes Pages: 351-352 Difficulty: 2 Ans: D Which of the following contains an ether-linked alkyl group? A) Cerebrosides B) Gangliosides C) Phosphatidyl serine D) Platelet-activating factor E) Sphingomyelin 6. Structural lipids in membranes Pages: 352-353 Difficulty: 2 Ans: A Sphingosine is not a component of: A) cardiolipin. B)
1.a , Answer: 4-(2,2-dibromoethyl)-3,5-dichloroheptane b. Answer: 6-sec-butyl-3,10-dimethyl-cyclodecyne c. Answer: cis-3,3-dimethyl-4-propyl-1,5-octadiene or (Z)-3,3-dimethyl-4-propyl-1,5-octadiene 2. Predict the major organic product for each reaction below. a. Answer: b.
(2) Although NH3 forms OH- with water, it did not donate any proton to form OH- but only gain. Therefore, it is a Bronsted-Lowry base but not an Arrhenius base 11. Define the following terms: (5) a. strong acid: acid that
Firstly, a carbonyl group is highly polarised, which means the positively charged carbon atom is exposed to nucleophilic attack. Grignard reagents act as nucleophiles. Secondly, the polarised carbonyl group allows any alpha-protons to be easily removed by strong bases (4). In this experiment, the Grignard reagent 1-methylbutyl magnesium bromide was prepared by reacting an excess of magnesium turnings with 2-bromopentane in diethyl ether. It was then reacted with propanal to give the secondary alcohol, 4-methyl-3-heptanol.
9. Lewis model: A Lewis acid is an electron-pair acceptor and a Lewis base is an electron-pair donor. 10. Strong acid: An acid that ionizes completely in aqueous solution. 11.
The bond between the fatty acid chain and the glycerol is called an ester linkage. The 3 fatty acids may be identical or they may have different structures. In the fatty acid chains the carbon atoms may have single bonds between them making the lipid saturated. These are usually solid at room temperature and are called fats. If one or more bonds between the carbon atoms are double bonds, the lipid is unsaturated.
When the solution is acidified during diazotization to form nitrous acid, the sulfanilic acid is precipitated out of solution as a finely divided solid, which is immediately diazotized. The finely divided diazonium salt is allowed to react immediately with dimethlaniline in the solution in which it was precipitated. Mechanism Diazotization: [pic] Diazo Coupling: Methyl orange is often used as an acid-base indicator. In solutions that are more basic than pH 4.4, methyl orange exists almost entirely as the yellow negative ion. In solutions that are more acidic than pH 3.2, it is protonated to form a red dipolar ion.