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The following questions refer to the twe...

The following questions refer to the twelve compounds given below. You may enter as many as six choices in each answer box.

Which compound may serve only as H-bond donors ?

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The correct Answer is:
a , c,f ,g, k,l
Compounds having L.P. or -ve charge on electronegative atoms are known as H-bond acceptor.
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Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are conformational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C – H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conformation that is almost completely free of strain. The most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Which among the following conformation of cyclohexane is the most stable form ?

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Structural isomers have different covalent linkage of atoms. Stereoisomers are compounds that have same sequence of covalent bonds but differ in the relative dispositions of their atoms in space. Geometri cal and optical isomers are the two important types of configurational isomers. The compound with double bonds or ring structure have restricted rotation, so exist in two geometrical forms. The double bonds in larger rings (ring size 10 carbon large) can also cause geometrical isomerism. The optical isomers rotate the plane of plane-polarised light. A sp^(3) -hybridised carbon atom bearing four different types of substituents is called an asymmetric centre or chiral centre. A chiral object or molecule cannot be superimposed on its mirror image. Stereoisomers that are mirror images of each other are called enantiomers. The stereosomers that the pot mirror images of each other are called diastereomers. Diasteremers have different physical properties. A racemic mixture is optically inactive and contains equal amounts of both the enantiomers. Resolution refers to method of separating a racemic mixture. Into two pure enantiomers. A meso compound is an optically inactive stereoisomer, which is achiral due to the presence of an internal plane of symmetry or centre of symmetry within the molecule. The following two compounds are

Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are conformational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C – H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conformation that is almost completely free of strain. The most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Dihedral angle between two methyl groups of n-butane in the gauche and anti forms are :

Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are conformational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C – H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conformation that is almost completely free of strain. The most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Dihedral angle in staggered (gauche) and eclipsed conformation are:

MS CHOUHAN-GENERAL ORGANIC CHEMISTRY -LEVEL - 2
  1. Which of the mono-nitrophenol derivatives above is the strongest acid ...

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  2. Which of the carbon-substituted phenol derivatives above is the strong...

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  3. The following questions refer to the twelve compounds given below. You...

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  4. The following questions refer to the twelve compounds given below. You...

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  5. The following questions refer to the twelve compounds given below. You...

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  6. Consider the following compounds and answer A and B. Which of th...

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  7. Which of the compounds is the strongest Lewis base ?

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  8. Rank the non-bonding electrons indicated by the arrows in order of inc...

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  9. In each of the following sections four nitrogen containing compounds a...

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  10. For the two sets of acids shown below, rank their acidity most acidic ...

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  11. rank their acidity most acidic to least acidic.

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  12. In each of the following sections four compounds are listed. In the bo...

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  13. In the two questions below, you are asked to rank the relative strengt...

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  14. In the two questions below, you are asked to rank the relative strengt...

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  15. In each of the following sections four compounds are listed. (Decreasi...

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  16. Rank in the order of increasing basic strength.

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  17. Compare acidic strength of the following (Write your answer in box).

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  18. Arrange the hydrogens in increasing order of their acidic strengths.

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  19. The compounds whose structures are shown below, incorporate a variety ...

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  20. The compounds whose structures are shown below, incorporate a variety ...

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