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How many sterogenic centers are there in...

How many sterogenic centers are there in Lovastain (Mevacor(R): a cholsesterol-lowering drug?

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The correct Answer is:
8
8 sterogenic centers
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Knowledge Check

  • The total energy of molecules is divided equally amongst the various degrees of freedom of a molecule. The distribution of kinetic energy along x, y, z axis are E_(K_(x)), E_(K_(y)), E_(K_(z)) Total K.e =E_(K_(x)) + E_(K_(y)) + E_(K_(z)) Since the motion of molecule is equally probable in all the three directions, therefore E_(K_(x)) = E_(K_(y)) = E_(K_(z)) =1/3 E_(K) =1/3 xx 3/2 kT = 1/2 kT , where k =R/N_(A) = Botzman constant. K.E. = 1/2 kT per molecule or =1/2 RT per mole. In vibration motion, molecules possess both kinetic energy as well as potential energy. This means energy of vibration involves two degrees of fiuedom. Vibration energy =2 xx 1/2kT =2 xx 1/2RT [ therefore two degrees of freedom per mole] If the gas molecules have n_(1) translational degrees of freedom, n_2 rotational degrees of freedom and n_(3) vibrational degrees of freedom, that total energy = n_(1)[(kT)/2] + n_(2) [(kT)/2] + n_(3) [(kT)/2] xx 2 Where 'n' is atomicity of gas. How many total degrees of freedom are present in H_(2) molecules in all types of motions ?

    A
    3
    B
    5
    C
    6
    D
    4

  • Following is the fact about the newly discovered superconductor of C_(60) (fullerene). The alkali metal fulleride superconductor M_(3)C_(60) has a cubic closest-packed (face-centered cubic) arragement of nearly spherical C_(60)^(3-) anions with M^(+) cations in the holes between the larger C_(60)^(3-) ions. The holes are of two types-octahedral holes, which are surrounded octahedrally by six C_(60)^(3-) ions, and tetrahedral holes, which are surrounded tetrahedrally by four C_(60)^(3-) ions. How many C_(60)^(3-) ions, octahedral holes, and tetrahedral holes are present per unit cell

    A
    5, 4, 4
    B
    3, 8, 4
    C
    4, 4 8
    D
    2, 1, 2

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