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In homologues, the matter which conforms to the same general formula and whose molecular composition differs by several CH2 groups is not necessarily homologues.
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Which of the following is incorrect? A. Organic compounds with similar structure and one or more CH 2 groups are homologues. B. A hydrocarbon having the same mass fraction of each constituent element must be the same hydrocarbon. C. The phenomenon that compounds have the same molecular formula but different structures is called isomerism. D. When the ratio of the constituent elements of the hydrocarbon, i.e. the amount of the C, H elements, is less than 1/2, the hydrocarbon is an alkane.
B No. All olefins have the same CH mass fraction, but not the same hydrocarbon.
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- 7. The homologue of benzene is an organic compound with only one benzene ring and then a ch2 atom group. Then why is the ring of toluene outside ch3 still its homologue
- 8. The homologues of C8H10 correspond to benzene have four isomers. Please write their structural formula The homologues of C8H10 correspond to benzene have four isomers. Please write their structural formulas
- 9. Please write down the structural formula of benzene homologues conforming to c9h12~ 8 Kinds ~
- 10. The number of isomers of C9H12 homologues belonging to benzene is?
- 11. Judgement: Organic matter with one or more CH 2 groups are homologues. Judgement: Organic compounds with one or more CH 2 groups are homologues.
- 12. Substances whose molecular composition differs by one or more CH2 groups must be homologues Can you give a counterexample? Substances whose molecular composition differs by one or more CH2 groups must be homologues Can you cite a counterexample? Substances whose molecular composition differs by one or more CH2 groups must be homologues Can you give us a counterexample?
- 13. How to prepare magnesium hydroxide with strong and weak bases? Find the chemical equation.
- 14. A. The R group of methionine is —CH 2—CH 2,—S—CH 3, and its molecular formula is that C5H11O2NSB. tyrosine is almost insoluble in water, while arginine is soluble A. The R group of methionine is —CH2—CH2,—S—CH3, then its molecular formula is C5H11O2NS B. Tyrosine is almost insoluble in water, whereas arginine is soluble in water, a difference caused by differences in R groups C. n amino acids have a total of m amino groups, then the number of amino groups in a polypeptide condensed from these amino acids must be m-n D. If the molecular formula of sweet peptide is C13H16O5N2,, the sweet peptide must be a dipeptide. Why sweet peptide two N must be dipeptide? Can not be a peptide?
- 15. Propylene, why must be written as CH2=CH-CH3, can not be written as CH3-CH=CH2
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- 17. -(CH2)16 CH3!
- 18. How to read CH2Cl-CH2-CH2-CH2-CH2-CH3? And this CH3-CHCl-CH2-CH2-CH2-CH3
- 19. - How to read the group CH2-CN?
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