(a)
Interpretation:
The structures of three monobromo derivatives obtained from reaction of
Concept introduction:
In
(b)
Interpretation:
The isomer in part (a) which is obtained from the most stable enol is to be stated.
Concept introduction:
Tautomers are isomers which differ only in the position of the protons and electrons of the double bond of the electronegative atom in the compound. There is no change in the carbon skeleton of the compound. This phenomenon which involves simple proton transfer in an intramolecular fashion is known as tautomerism. The very common example of tautomerism is Keto-enol tautomerism. It is possible in either way acid or base-catalyzed.
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EBK ORGANIC CHEMISTRY
- Predict the major products formed when benzoyl chloride (PhCOCl) reacts with the following reagents.(a) ethanoarrow_forward(a) Draw the structure of the following :(i) p-Methylbenzaldehyde (ii) 4-Methylpent-3-en-2-one(b) Give chemical tests to distinguish between the following pairs of compounds :(i) Benzoic acid and Ethyl benzoate, (ii) Benzaldehyde and Acetophenone.(iii) Phenol and Benzoic acid.arrow_forwardPredict the major products (including stereochemistry) when cis-3-methylcyclohexanol reacts with the following reagents. (a) concentrated HBr (b) TsCl/pyridine, then NaBrarrow_forward
- Predict the major products formed when benzoyl chloride (PhCOCl) reacts with the following reagents.(a) ethanol (b) sodium acetate (c) anilinearrow_forward(a) Account for the following :(i) Propanal is more reactive than propanone towards nucleophilic reagents.(ii) Electrophilic substitution in benzoic acid takes place at meta position.(iii) Carboxylic acids do not give characteristic reactions of carbonyl group.(b) Give simple chemical test to distinguish between the following pairs of compounds:(i) Acetophenone and benzaldehyde(ii) Benzoic acid and ethylbenzoate.arrow_forwardGive reasons for the following: (i) p-nitrophenol is more acidic than p-methylphenol. (ii) Bond length of C—O bond in phenol is shorter than that in methanol. (iii) (CH3)3C—Br on reaction with sodium methoxide (Na+ _OCH3) gives alkene as the main product and not an ether.arrow_forward
- Electrophilic aromatic substitution usually occurs at the 1-position of naphthalene, also called the a position. Predict the major products of the reactions of naphthalene with the following reagents.(a) isobutylene and HF (b) cyclohexanol and BF3 (c) fuming sulfuric acidarrow_forward1. Deduce the structure of each compound from the information given. All unknowns in this problem have molecular formula C8H12. (a) Upon catalytic hydrogenation, unknown W gives cyclooctane. Ozonolysis of W, followed by reduction with dimethylsulfide, gives octanedioic acid, HOOC—(CH2)6—COOH. Draw the structure of W. (b) Upon catalytic hydrogenation, unknown X gives cyclooctane. Ozonolysis of X, followed by reduction with dimethyl sulfide, gives two equivalents of butanedial, O=CH—CH2CH2—CH=O. Draw the structure of X.arrow_forwardPlease give the main substitution product for each of the following reactions, and indicate the dominant mechanism: (a) 1-bromopropane + NaOCH3 → (b) 3-bromo-3-methylpentane + NaOC2H5 →arrow_forward
- The odor of ripe bananas and many other fruits is due to the presence of esters. For example: Banana oil (isopentyl acetate) (a) Write the name (common or IUPAC) of the ester responsible for the fragrance of the following: pineapple, orange, apple, peach, & lavender (b) Choose one fragrant from (a) and name the alcohol and the carboxylic acid needed to synthesize this ester. (c) Show the detailed mechanism of the Fischer Esterification reaction that will be involved in the synthesis of the fragrant you have chosen in part (a).arrow_forwardShow how you would use simple chemical tests to distinguish between the following pairs of compounds. In each case, describe what you would do and what you would observe. (a) cyclohexanol and cyclohexene (b) cyclohexanol and cyclohexanone (c) cyclohexanone and 1-methylcyclohexanolarrow_forwardThe name of the parent six-membered sulfur-containing heterocycle is thiane. It is numbered beginning at sulfur. Multiple incorporation of sulfur in the ring is indicated by the prefixes di-, tri-, and so on. (a) How many methyl-substituted thianes are there? Which ones are chiral? (b) Write structural formulas for 1,4-dithiane and 1,3,5-trithiane. (c) Which dithiane isomer (1,2-, 1,3-, or 1,4-) is a disulfide?(d) Draw the two most stable conformations of the sulfoxide derived from thiane.arrow_forward
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