A. The same compound is obtained from the hydrogenation reaction of maleic or fumaric acid
B. A mixture of acetone and propanal (5.8 g), which contains 20% acetone, reacts by heterogeneous catalysis with 2.24 l of hydrogen.
E. Hydrogenation reactions are specific to hydrocarbons containing multiple bonds.
C. When 2-butyne is hydrogenated in the presence of palladium poisoned with lead salts, the obtained product presents geometrical isomers.
D. Carbonyl group reduction in monosaccharides leads to corresponding acids.
D. Maleic anhydride is obtained by benzene oxidation.
A. Oxidation of tert-butanol with potassium dichromate, in the presence of sulphuric acid, leads to butanoic acid.
E. Cupric hydroxide oxidizes glucose.
B. When alcohols are oxidized with potassium permanganate, in the presence of sulphuric acid, the colour of the reaction mixture turns form orange to green.
C. 2-ketopentanoic acid and oxalic acid are obtained when 1-methyl-1,4-cyclohexadiene is oxidized with KMnO4, in the presence of sulphuric acid.
B. 2,7-Octanedione is obtained by the oxidation of 1,2-dimethyl-1-cyclohexadiene with K2Cr2O7 and H2SO4.
E. Synthesis of alkenes from alkanes is an oxidation process.
C. Partial oxidation of petrol fuel (gasoline) can yield carbon monoxide.
D. p-aminobenzoic acid can be obtained by the oxidation of p-aminobenzaldehyde with potassium permanganate in the presence of sulphuric acid.
A. When isoprene is oxidized with K2Cr2O7 and H2SO4, the reaction products are the ketopropionic acid, CO2 and H2O.
B. The products formed by incomplete oxidation are compounds with a lower number of carbon atoms.
D. The oxidation reaction is reversible.
C. When naphthalene and o-xylene are oxidized with the same volume of oxygen, the working mass ratio between naphthalene and o-xylene is 0.805.
A. 48 g of oxygen are obtained at 100% yield from 1 mole of K2Cr2O7 in the presence of H2SO4, in the presence of a reducing agent.
E. Mild oxidation of tertiary alcohols yields an acid.
C. It contains two types of anions.
E. It is an ionic substance.
B. The solution resulting after its dissolution in water has an alkaline character.
D. It is a salt.
A. It is a detergent.
E. Diphenylamine is a secondary amine.
A. Amines are weaker bases compared to ammonia.
D. N,N-dimethyl-phenylamine is a stronger base compared to diphenylamine.
C. Primary aliphatic amines are stronger bases compared to secondary aliphatic amines.
B. The basicity of amines is modified radically depending on the carbon type involved in the bond (primary, secondary or tertiary).
A. When a small quantity of ammonia is added.
D. When small amounts of ammonia and acetic acid are added (1:1 molar ratio).
C. When a small quantity of 2-aminopropionic acid is added.
E. None of the answers A-D are true.
B. When a small quantity of acetic acid is added.
C. The percent composition of formaldehyde and lactic acid (alpha-hydroxy-propionic acid) is identical.
B. The percent composition of ammonium cyanate and urea is identical.
D. Quantitative analysis of carbon and hydrogen in organic compounds produces substances with identical molecular mass.
A. Hydrogen and sulphur are organogenic elements.
E. The atomic ratio of the glucose molecule is C:H:O=1:2:1.
D. 5-Ethynyl-2-methyl-3-vinyl-1,3,6-heptatriene contains primary, secondary, tertiary and quaternary carbon atoms.
C. 2,3,4-Trimethylpentane does not contain quaternary carbon atoms
E. Phenyl-ethane contains five secondary carbon atoms.
B. Ethyl-cyclopentane contains primary, secondary and tertiary carbon atoms.
A. Cyclohexane and cyclopropane contain only secondary carbon atoms.
A. The formula CnH2n-2 corresponds to an alkyne, alkadiene, cycloalkyne.
B. Monoelectronic orbitals may exist only in the fundamental state of elements.
C. Interatomic distances represent the sum of the atomic diameters of bonded atoms.
D. In alcohols, oxygen is involved in two sigma bonds.
E. There are 5 sigma bonds in ethene.
D. The length of the covalent bond increases from the simple to the triple bond.
B. In the homogenous covalent bonds, the bond energy increases from the simple to the triple bond.
C. The hydrocarbon having the molecular mass of 58 is saturated.
A. Nitrogen may be involved in simple, double and triple covalent bonds.
E. Carbon is involved only in double covalent bonds.
C. Decreasing the number of carbon atoms in the structure of organic substances increases their number of isomers.
D. In multiple covalent heterogeneous bonds, the involved carbon atoms may be hybridized sp and sp2.
A. The presence of asymmetric carbon atoms in the structure of substances decreases their number of isomers.
E. In alkanes, the involved carbon atoms are only hybridized sp3.
B. One of the validity criteria of the molecular formula is that the sum of all covalencies of the component elements must be an odd number.
E. 6 isomers in total
A. 3 linear carbon chain isomers
B. 4 branched carbon chain isomers
C. 5 aldehydes isomers
D. 3 isomers with tertiary carbon atoms
D. 2,3-diaminobutane may present optical active configurations as well as mesoforms
C. They do not rotate the plane of polarized light.
B. They have a symmetry plane.
E. Glycine may present mesoforms.
A. They contain asymmetric carbon atoms.
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