41. The tertiary structure of proteins is maintained by ________ bonds. A. hydro

Question

41. The tertiary structure of proteins is maintained by ________ bonds. A. hydrogen     B. dipole-dipole   C. ion-dipole   D. Covalent     E. All of these                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          2. How many Isomers of C2H2Cl2 are polar?                                                                                                                                                                                                                                                    3. How many isomers are possible for C4H10?         A. 1     B. 2     C. 3       D. 4      E. 10

Explanation / Answer

Q41.

mainly: Hydrogen bonding, ionic bonding, covalent bonding and hydrphobic interactions

therefore, from the list, the most precise answer is All of these

Q2.

C2H2Cl2 has the next structure:

(H2)- C=C-(Cl2) -- this is polar

OR

(H-Cl)- C=C-(H-Cl) -- this is polar as well

(Cl-H)- C=C-(Cl-H) -- this is polar as well

(Cl-H)- C=C-(H-Cl) -- this is also polar

Note that they are all polar due to difference in electronegativity

Q3.

C4H10 possible isomers:

linear CH3-CH2-CH2-CH3

Methyl branch CH3-CH(CH3)-CH3

Therefore, only 2 isomers are possible

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