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Consider all possible isomeric ketones, ...

Consider all possible isomeric ketones, including stereoisomers, of MW = 100. All these isomers are independently reacted with `NaBH_(4)` (NOTE: stereoisomers are also reacted separately). The total number of ketones that give a racemic product(s) is/are

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A schematic analysis of the reaction of the enantiomer with racemic mixture is shows below: {:(d,+,"d and l",rarr,(d)-(d)),("The(+)-form of",,"A racemic mixture of",,+),("chiral molecules",,"other molecules with",,(d)-(l)),(,,50%(d) and 50%(l),,):} The products (d-d) and (d-l) are clearly neither identical nor enantiomers (non-superimposable mirror images) as the diastereomers, stereoisomers that are not mirror images' . The formation of diasteromers allows the separation of enantiomers (called resolution) which is not easy as enantiomers have identical physical properties. One general with naturally occurring chiral molecule to form a pair of diastereomers. These can be separated easily as they have different physical properties. If the original chemical reaction can be reversed, the enantiomers can be isolated. How many diastereomers are possible among all the possible stereoisomers of 2,3-dibromopentane ?

Read the following text and answer the following questions on the basis of the same: Band theory of solid: Consider that the Si or Ge crystal contains N atoms. Electrons of each atom will have discrete energies in different orbits. The electron energy will be same if all the atoms are isolated, i.e., separated from each other by a large distance. However, in a crystal, the atoms are close to each other (2 Å to 3 Å) and therefore the electrons interact with each other and also with the neighbouring atomic cores. The overlap (or interaction) will be more felt by the electrons in the outermost orbit while the inner orbit or core electron energies may remain unaffected. Therefore, for understanding electron energies in Si or Ge crystal, we need to consider the changes in the energies of the electrons in the outermost orbit only. For Si, the outermost orbit is the third orbit (n = 3), while for Ge it is the fourth orbit (n = 4). The number of electrons in the outermost orbit is 4 (2s and 2p electrons). Hence, the total number of outer electrons in the crystal is 4N. The maximum possible number of outer electrons in the orbit is 8 (2s + 6p electrons). So, out of the 4N electrons, 2N electrons are in the 2N s-states (orbital quantum number l = 0) and 2N electrons are in the available 6N p-states. Obviously, some p-electron states are empty. This is the case of well separated or isolated atoms. The maximum possible electrons in an orbit is:

ALLEN-ALKENE, ALKANE & ALKYNE -EXERCISE-5[B]
  1. Among P,Q,R and S, the aromatic compound(s) is/are

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  2. After completion of the reactions (I and II) , the organic compound(s...

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  3. Consider all possible isomeric ketones, including stereoisomers, of MW...

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  4. The major product in the following reaction is underset(2. "aq. aci...

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  5. In the following reaction Compound X is :

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  6. In the following reactoins The major compound Y is

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  7. Positive Tollen's test is observed for

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  8. The major product of the following reaction sequence is :

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  9. The major product of nitration of Benzoic acid is -

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  10. The organic product formed in the reaction C(6) H(5) COOH overset ((I...

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  11. Which of the following carboxylic acids undergoes decarboxylation easi...

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  12. The molecular weight of benzoic acid in benzene as determined by depre...

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  13. CH(3)CH(2)CO OHunderset("Red P")overset(Br(2))to[X]overset(NH(3)(alc.)...

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  14. Among the given compounds, the most susceptible to nucleophilic attack...

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  15. Statement-I: Acetic acid does not undergo haloform reaction. Because...

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  16. When propionic acid is treated with aqueous sodium bicarbonate, CO(2) ...

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  17. Benzoyl chloride is prepared from benzoic acid by

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  18. Which of the following acids has the smallest dissociation constant-

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  19. formed by P & Q can be differentiated by :

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  20. What is X?

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