Can you please explain why numbers 14,18,19,20,21,22,23,25 are incorrect and why the answers next to them are correct.

E 14. Which of the following is the common name for the compound below? (A.) 1-ethyl-2-methylbenzene B. 1-ethyitoluene D. 2-ethyl-1-methylbenzene E. o-ethyltoluene C. 2-methyltoluene 15. Small molecules that make up the repeat unit in polymers are called A. monomers B. minipolymers C. synthetic polymers D. alkenes E. alkynes 16. Which of the following is the correct structural formula for 3-methyicyclohexene A. B. A. and B. and c. and D. and D. 18. 5 The major product of the reaction of 3 -methyl-2-pentene with HCl is A. 4-chloro-3-methyipentane B. 1-chloro-3-methylpentane. C. 2-chloro-3-methylpentane. D. 3-chloro-3-methylpentane. E. 3-chloro-3-methylpentene. B 19. D. The reaction of cyclohexene and Cl2 yields A. 1-chlorocyclohexene. B. 1,2-dichlorocyclohexane. C. 1,3-dichlorocyclohexane. (B) 2,3-dichlorocyclohexane. E. 3,4-dichlorocyclohexane. C 20. The hydrogenation of an alkene gives a(n) A. benzene B. isomer C. alkane D. alkene E. alkyne A 21. B What is the IUPAC name of the following compound? A. 5-methyl-2-hexyne B. 2-methyl-4-hexyne C. 4-isopropyl-2-pentyne D. 2,4-dimethyl-4-pentyne E. 1,1-dimethyl-3-pentyne E.22. A Saran, used as a plastic wrap for foods, is a polymer with the following structure. What is the monomer unit of Saran? (A. 1,1-dichloroethane B. 1-chloroethane C. 1-chloroethyne D. ethane E. 1,1-dichloroethene 823. What intermolecular force generally accounts for the higher boiling points of alcohols compared to alkenes? A. ionic B. hydrogen bonding D. London E. Ion-dipole 24. 2 -butanol (CH3CHOHCH2CH3) is classified as a(n) A. primary alcohol B. secondary alcohol C. tertiary alcohol D. ether 25. What is the correct IUPAC name for the compound shown here? A. 2,2-dimethyl-6-hexanol D. 3,3-dimethyl-6-hexanol B) 2,3-dimethyl-7-heptanol E. 5-isopropyl-1-hexanol C. 5,6-dimethyl-1-heptanol