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  • Order of basicity of amines


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  • The order of basicity for primary, secondary and tertiary amines are: Secondary > Primary > Tertiary > NH3 * Amines are basic in nature as they have lone pair of electrons on nitrogen Therefore, they have a strong tendency to donate this lone pair of electrons to electron acceptors * The stability of conjugate acids formed is dependent on the extent of H-bonding,and greater the number of H-atoms on N more stable is the conjugate acid * The conjugate acid of primary amine is the most stable with greater number (3) of H-bonds than > Secondary > tertiary But primary amines are less basic than secondary as the electron density on the N atom is less and lone pair of electrons are not readily available for protonation * The two opposing factors ie the stability of conjugate acids formed and ease of availability of electrons for Protonation, balance each other in case of secondary amines and it is most basic 

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    • 1. What types of orbital overlap occur in Cumulene?
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    • 2. Hydrophilic molecules readily associate with

    • Options
    • A. water
    • B. alcohols
    • C. both A & B
    • D. none of the above
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    • 3. Which molecule contains a nonpolar covalent bond?

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    • A. Cl2
    • B. Br2
    • C. H2
    • D. All of the above
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    • 4. Hydrogen bonds and hydrophilic interactions are

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    • A. Strong chemical bonds that hold together the atoms within a molecule
    • B. Weak chemical bonds that hold together the atoms within a molecule
    • C. Strong chemical bonds that link together separate molecules
    • D. Weak chemical bonds that link together separate molecules
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    • 5. Which group 4A element has the highest ionization energy?

    • Options
    • A. Silicon
    • B. Tin
    • C. Lead
    • D. Carbon
    • Discuss
    • 6. Which of the following is true about compounds?

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    • A. They are substances
    • B. They have properties similar to those of their component elements
    • C. They can be physically separated into their component elements
    • D. They have compositions that vary
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    • 7. The complexity and variety of organic molecules is due to

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    • A. their interaction with water
    • B. their tremendously large sizes
    • C. the chemical versatility of carbon atoms
    • D. the variety of rare elements in organic molecules
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    • 8. A yellow element that stinks when burned

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    • A. Bromine
    • B. Sulphur
    • C. Chlorine
    • D. Fluorine
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    • 9. The atomic mass of an element depends upon the

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    • A. number of electrons
    • B. number of protons
    • C. number of neutrons
    • D. All of the above
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    • 10. Metals that are liquid at room temperature?

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    • A. Caesium
    • B. Gallium
    • C. Rubidium
    • D. Mercury
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