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Examine the following formulas and selec...

Examine the following formulas and select those pairs that satisfy the following conditions : Be sure to write two letters (and only two) in each answer box. In the second and fourth parts more than one answer is possible.

Which are conformational isomers?

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(d & e)
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Electronic configuration of multielectron atoms can be written by the use of four quantum numbers and also by following certain principles. Pauli's exclusion principle suggests that maximum capacity of an atomic orbital is two. Auf bau principle suggests that the lower energy orbitals are filled first and hence stability can be attained. Hunds rule of maximum multiplicity suggests that pairing occurs with one electron. The arrangement of electrons in the space around the nucleus can be understood only after writing the electronic configuration. Thus writing electronic configuration is more important in the structure of an atom. The set of quantum numbers not possible for electrons present in potassium atom in its ground state

It is tempting to think that all possible transitions are permissible, and that an atomic spectrum arises from the transition of the electron from any initial orbital to any other orbital. However, this is not so, because a photon has an intrinsic spin angular momentum of sqrt2 (h)/(2pi) corresponding to S = 1 although it has no charge and no rest mass. On the other hand, an electron has got two types of angular momentum : Orbital angular momentum, L=sqrt(l(l+1))h/(2pi) and spin angular momentum, arising from orbital motion and spin motion of electron respectively. The change in angular momentum of the electron during any electronic transition mush compensate for the angular momentum carries away by the photon. to satisfy this condition the difference between the azimuthal quantum numbers of the orbital within which transition takes place must differ by one. Thus, an electron in a d-orbital (1 = 2) cannot make a transition into an s = orbital (I = 0) because the photon cannot carry away enough angular momentum. An electron as is well known, possess four quantum numbers n, I, m and s. Out of these four I determines the magnitude of orbital angular momentum (mentioned above) while (2n m determines its z-components as m((h)/(2pi)) the permissible values of only integers right from -1 to + l. While those for I are also integers starting from 0 to (n − 1). The values of I denotes the sub shell. For I = 0, 1, 2, 3, 4,..... the sub-shells are denoted by the symbols s, p, d, f, g, .... respectively The spin-only magnetic moment of free ion is sqrt(8) B.M. The spin angular momentum of electron will be

Following criteria should be taken in consideration for resonance. The major contributor is the one with the lower energy good contributors generally have all octets satisfied, as many bonds are possible andas little charge separation as possible negative charges are more stable on the more electronegative atoms. Resonance stabilization is most important when it serves to delocalize a charge over two or more atoms The two important resonating structures of nitromethane are The resonance hybrid of nitromethane can be written as

MS CHOUHAN-ISOMERISM (STRUCTURAL & STEREOISOMERISM)-LEVEL 2
  1. Examine the following formulas and select those pairs that satisfy the...

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  2. Examine the following formulas and select those pairs that satisfy the...

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  3. Examine the following formulas and select those pairs that satisfy the...

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  4. Consider the following statements regarding the given projection (True...

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  5. Consider the following statements regarding the given projection (True...

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  6. Consider the following statements regarding the given projection (True...

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  7. Consider the following statements regarding the given projection (True...

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  8. Examine the following structural formulas and select those that are ch...

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  9. The configuration of eight compounds, a through h are shown below, usi...

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  10. The configuration of eight compounds, a through h are shown below, usi...

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  11. The configuration of eight compounds, a through h are shown below, usi...

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  12. The configuration of eight compounds, a through h are shown below, usi...

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  13. The structural formula of ten compounds, (I) through (X) are drawn bel...

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  14. The structure of one of the enantiomers of the amino acid cysteine is ...

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  15. Identify the following double bonds either E, Z or None (N) in the com...

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  16. (a) Bongkrekic acid is a toxic compound produced by Pseudomonas cocove...

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  17. Designate the following double bonds as E, Z or none (N) configuration...

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  18. The following compounds may exist as two or more stereoisomers. These ...

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  19. Find relationship between given pair :

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  20. Structural formula of compound (A) is following: The correct stat...

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