In the above question only those compound exhibit geometrical isomer which have restricted rotation around double bond. Only in option (d) has show geometrical isomerism
J and K CET-(2007)
GENERAL ORGANIC CHEMISTRY
232091
Which of the following conformers for ethylene glycol is most stable?
1
2
3
4
Explanation:
In almost all compounds generally anticonformation is most stable. But in case of ethylene glycol the gauche conformation is most stable. Anti /staggered and eclipsed conformer are not more stable due to less torsional strain and less steric strain in gauche conformer as compared to eclipsed conformer. Though strains are less in staggered /anti conformer but extent of H-bonding in gauche conformer is more which makes it most stable. In eclipsed form also there will be H-bonding but the steric repulsions dominate much more. Therefore, gauche is most stable than anti also. Order will be -
In the above question only those compound exhibit geometrical isomer which have restricted rotation around double bond. Only in option (d) has show geometrical isomerism
J and K CET-(2007)
GENERAL ORGANIC CHEMISTRY
232091
Which of the following conformers for ethylene glycol is most stable?
1
2
3
4
Explanation:
In almost all compounds generally anticonformation is most stable. But in case of ethylene glycol the gauche conformation is most stable. Anti /staggered and eclipsed conformer are not more stable due to less torsional strain and less steric strain in gauche conformer as compared to eclipsed conformer. Though strains are less in staggered /anti conformer but extent of H-bonding in gauche conformer is more which makes it most stable. In eclipsed form also there will be H-bonding but the steric repulsions dominate much more. Therefore, gauche is most stable than anti also. Order will be -
In the above question only those compound exhibit geometrical isomer which have restricted rotation around double bond. Only in option (d) has show geometrical isomerism
J and K CET-(2007)
GENERAL ORGANIC CHEMISTRY
232091
Which of the following conformers for ethylene glycol is most stable?
1
2
3
4
Explanation:
In almost all compounds generally anticonformation is most stable. But in case of ethylene glycol the gauche conformation is most stable. Anti /staggered and eclipsed conformer are not more stable due to less torsional strain and less steric strain in gauche conformer as compared to eclipsed conformer. Though strains are less in staggered /anti conformer but extent of H-bonding in gauche conformer is more which makes it most stable. In eclipsed form also there will be H-bonding but the steric repulsions dominate much more. Therefore, gauche is most stable than anti also. Order will be -
In the above question only those compound exhibit geometrical isomer which have restricted rotation around double bond. Only in option (d) has show geometrical isomerism
J and K CET-(2007)
GENERAL ORGANIC CHEMISTRY
232091
Which of the following conformers for ethylene glycol is most stable?
1
2
3
4
Explanation:
In almost all compounds generally anticonformation is most stable. But in case of ethylene glycol the gauche conformation is most stable. Anti /staggered and eclipsed conformer are not more stable due to less torsional strain and less steric strain in gauche conformer as compared to eclipsed conformer. Though strains are less in staggered /anti conformer but extent of H-bonding in gauche conformer is more which makes it most stable. In eclipsed form also there will be H-bonding but the steric repulsions dominate much more. Therefore, gauche is most stable than anti also. Order will be -
In the above question only those compound exhibit geometrical isomer which have restricted rotation around double bond. Only in option (d) has show geometrical isomerism
J and K CET-(2007)
GENERAL ORGANIC CHEMISTRY
232091
Which of the following conformers for ethylene glycol is most stable?
1
2
3
4
Explanation:
In almost all compounds generally anticonformation is most stable. But in case of ethylene glycol the gauche conformation is most stable. Anti /staggered and eclipsed conformer are not more stable due to less torsional strain and less steric strain in gauche conformer as compared to eclipsed conformer. Though strains are less in staggered /anti conformer but extent of H-bonding in gauche conformer is more which makes it most stable. In eclipsed form also there will be H-bonding but the steric repulsions dominate much more. Therefore, gauche is most stable than anti also. Order will be -
