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Consider the following conformations of ...

Consider the following conformations of 3-Aminopropanal, amongst the given conformations (P, Q, R, S) one of them is most stable.

The correct statements for the above is/are
(I) H-bonding is present in the most stable conformer
(II) Gauche conformation is the most stable conformer
(III) Anti conformation is the most stable conformer
(IV) larger groups being separated by maximum distance in the conformer

A

II & IV

B

I & II

C

III & IV

D

I & IV

Text Solution

Verified by Experts

The correct Answer is:
B
1) Stable due to H-bonding
2) P is most stable due to H-bonding in it.s gauche confomations.
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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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AAKASH SERIES-ISOMERISM -PRACTICE SHEET EXERCISE-II (Stereo Isomerism) LEVEL-I (MAIN) Straight Objective Type Questions
  1. The dihedral angle between the two methyl groups in gauche conformatio...

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  2. The dihedral angle between the two methyl groups in anti conformation ...

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  3. The number of conformational isomers possible of n-butane about C(2)-C...

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  4. Match List-I with List-II and select the correct option.

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  5. Consider the following conformations of 3-Aminopropanal, amongst the g...

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  6. Most stable carbocation among the following is

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  7. Sino-atrial node is present in

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  8. Which of the following is associated with Torsional strain ?

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  9. Among the structure shown below, which has lowest potential energy?

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  10. Increasing order of stability among the three main conformation (i.e. ...

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  11. In which of the following has minimum torsional strain and minimum Van...

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  12. Which of the following pairs of compounds are geometrical isomers

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  13. The cause of cis-trans isomerism is

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  14. Which of the following compounds exhibits geometrical isomerism? und...

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  15. Which of the following is classified as Z and trans-isomer?

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  16. Geometrical isomerism results because molecules has :

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  17. Which of the following can show geometrical isomerism

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  18. Which of the following orders of stability is correct among these two ...

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