18. Which of the following functional groups could act as a buffering agent in A

Question

18. Which of the following functional groups could act as a buffering agent in A. hydroxyl group C. carbonyl group solution? 19. (4) Ex B. amino acid C. methyl group plain how the properties of water makes it such an important molecule for life? 20. (4) Cite two reasons why carbon is the base atom of organic molecules? 21. Enantiomers have B. the same atoms A. the same formula but different structure. C. four different atoms or groups bonded to a carbon atom. D. many aunts. B. hydroxyl D. carboxyl 22. Of the following hydrocarbon functional groups, which one can function as an acid? A. amino C. sulfhydryl 23. Of the following hydrocarbon functional groups, which one is the least reactive? B. hydroxyl D. carboxyl A amino C. methyl Lidod carhehydrate rings depends on the position of the

Explanation / Answer

18. Option B is correct.

Amino acids contain a proton donating as well as proton accepting groups. Hence they can serve as buffers.

19. Water is considered as the universal solvent. Evolution on earth is centered around the water. ALmost all the cellular reactions occur in the aqueous environment. It can dissolve all the polar and many non-polar solutes. The properties of water are attributed to its ability to form extensive H-bonds.

20.

i. Carbon can form bonds with four different atoms in its excited state.

ii. It can form chains, cyclic compounds and heterocyclic compounds (catenation property).

21. Option A is correct.

Enantiomers = A pair of compounds that are mirror images of each other.

22. Option D is correct.

Carboxyl group = -COOH

-COOH ----> -COO- + H+

23. Option C is correct.

Methyl group is least active among the given functional groups.

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