Sure, here are the paraphrased versions of the questions in the same language: 70. Are the following statements

70. Are the following statements about the significance of the theory of the structure of organic compounds correct?
a. The theory of structure has enabled the explanation of the diversity of organic compounds.
b. It is possible to synthesize new substances with predetermined properties from this theory.
1) Only statement a is correct; 3) Both statements are correct; 2) Only statement b is correct; 4) Both statements are incorrect.

15. Are the following statements about the theory of the structure of organic compounds by A. M. Butlerov correct?
a. The theory of structure is applicable only to substances with molecular structure.
b. The theory of structure considers the spatial arrangement of atoms.
1) Only statement a is correct; 3) Both statements are correct; 2) Only statement b is correct; 4) Both statements are incorrect.

16. Are the following statements about the structure of organic substances correct?
a. The structure shows the spatial arrangement of atoms in the molecules of the compound.
b. The mutual influence of atoms determines the properties of compounds.
1) Only statement a is correct; 3) Both statements are correct; 2) Only statement b is correct; 4) Both statements are incorrect.

17. Are the following statements about structural formulas of organic compounds correct?
a. Structural formulas are used to express the substance’s structure and show the sequence of atom connections in molecules.
b. Lines between element symbols in structural formulas represent chemical bonds.
1) Only statement a is correct; 3) Both statements are correct; 2) Only statement b is correct; 4) Both statements are incorrect.

18. Are the following statements about the bonding of organic compounds correct?
a. In the acetylene molecule, a double bond forms between carbon atoms.
b. Organic compounds can have single, double, or triple bonds.
1) Only statement a is correct; 2) Only statement b is correct; 3) Both statements are correct; 4) Both statements are incorrect.

19. The reason for hybridization is:
1) The formation of covalent bonds;
2) The transition of an atom to an excited state;
3) The formation of shared electron pairs;
4) The transfer of electrons from one atom to another.

22. The primary cause of isomer formation is:
1) Different spatial arrangement of carbon atoms;
2) Inability to rotate carbon atoms around a double bond;
3) Presence of carbon atoms in a hybridized state;
4) Lower strength of π-bonds compared to σ-bonds.

23. Homolytic cleavage of a covalent bond results in:
1) Cations; 3) Atoms;
2) Anions; 4) Radicals.

25. Hybrid sp3 orbitals are formed by:
1) One 2s and three 2p orbitals;
2) One 2s and two 2p orbitals;
3) One 2s and one 2p orbitals;
4) Two 2s and two 2p orbitals.

26. Hybrid sp2 orbitals are formed by:
1) One 2s and three 2p orbitals;
2) One 2s and two 2p orbitals;
3) One 2s and one 2p orbitals;
4) Two 2s and two 2p orbitals.

27. Hybrid sp orbitals are formed by:
1) One 2s and three 2p orbitals;
2) One 2s and two 2p orbitals;
3) One 2s and one 2p orbitals;
4) Two 2s and two 2p orbitals.

29. The most characteristic bond for organic substances is:
1) Ionic;
2) Covalent nonpolar;
3) Hydrogen;
4) Covalent polar.

30. When a triple bond is formed in a hydrocarbon molecule, hybridization involves:
1) One s and one p electron;
2) One s and one p electron;
3) One s and two p electrons;
4) Two s and two p electrons.