Staggered Conformation

Q. The dihedral angle between the hydrogen atoms of two methyl groups in staggered conformation of ethane is :

1. ${120}^{\circ }$
2. ${180}^{\circ }$
3. ${60}^{\circ }$
4. ${90}^{\circ }$

Q. Which is the most stable conformer of ethane?

1. Skew conformer
2. All conformers are equally stable
3. Eclipsed conformer
4. Staggered conformer

Q.

The strength of bonds formed by 2s - 2s, 2p - 2p and 2p - 2s overlap has the order:

1. > >

2. > >

3. > >

4. > >

Q. The correct statement regarding the comparison staggered and eclipsed conformation of ethane,

1. The staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain.
2. The esclipsed conformation of ethane is more stable than staggered conformation, because ecilpsed conformation has no torsional strain
3. The ecipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain.
4. The staggered conformation of ethane is low stable than eclipsed conformation, because staggered conformation has torsional strain

Q. what is jahn teller distortion?

Q. In the given three conformational isomers which of the following has minimum torsional strain and minimum van der Waals strain.

1. 
2. 
3. All of the above.
4. 

Q. Choose the increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of 2- Fluoro ethanol.

1. Eclipse < Gauche < Anti
2. Gauche < Eclipse < Anti
3. Eclipse < Anti < Gauche
4. Anti < Gauche < Eclipse

Q. Which of the two conformation among the following represents staggered form of ethane?

1. 1 and 4
2. 2 and 3
3. 1 and 3
4. 1 and 2

Q. Which is true about conformers of 1, 1, 2, 2-tetrachloroethane?

1. $\text{The most stable conformer is non-polar}$
2. $\text{In the least stable conformer, two Cl-atoms are eclipsed to hydrogen atoms}$
3. $\text{In the most stable conformer, dihedral angle between hydrogen atoms in}{60}^{\circ }$
4. $\text{The most stable conformer has dihedral angle of}{60}^{\circ }$

Q. Which of the following represents the staggered conformation with dihedral angle $\varphi ={60}^{\circ }$ ?

1. 
2. 
3. 
4. 

Q. At room temperature, the eclipsed and staggered form of ethane cannot be isolated because:

1. both the conformations are equally stable
2. there is large barrier of rotation about the sigma bond
3. they interconvert rapidly
4. the energy difference between the conformation is large

Q. Which of the following is the correct structure for staggered conformation of n-propane?

1. 
2. 
3. 
4. 

Q.

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Q. $C_2$ is rotated anti- clockwise ${120}^{\circ }$ about $C_2-C_3$ bond, the resulting conformer is

1. Partially eclipsed
2. Eclipsed
3. Gauche
4. Staggered

Q. What is the order of potential energies of the given conformers of 1, 2 - dichloroethane?

1. I < II < III < IV
2. IV < III < II < I
3. II < I < III < IV
4. II < I < IV < III

Q. The most stable conformation of 3-fluorobutan-2-ol is:

1. 
2. 
3. 
4. 

Q. In the given conformation, $C_2$ is rotated about $C_2-C_3$ bond anticlockwise by an angle of ${120}^{\circ }$, then the conformation obtained is:

1. Fully eclipsed conformation
2. Partially eclipsed conformation
3. Gauche conformation
4. Staggered conformation

Q. If the velocity of hydrogen molecule is 5*10000 cm/sec , then its broglie wavelenghth is

Q. Choose the increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of 2- Fluoro ethanol.

1. Eclipse < Gauche < Anti
2. Gauche < Eclipse < Anti
3. Eclipse < Anti < Gauche
4. Anti < Gauche < Eclipse

Q. Choose the correct statement for the following newman projection of n-butane :

1. It is an eclipsed conformation
2. It is an anti (staggered) conformation.
3. It is a skew conformation.
4. None of the above

Q. Which is the most stable conformer of ethane?

1. Skew conformer
2. Eclipsed conformer
3. Staggered conformer
4. All conformers are equally stable

Q. Which of the following represents the staggered conformation with dihedral angle $\varphi ={60}^{\circ }$ ?

1. 
2. 
3. 
4. 

Q.

In the given conformation $C_2$ is rotated about $C_2-C_3$ bond anticlockwise by an angle of ${120}^{\circ }$ then the conformation obtained is.

1. Fully eclipsed conformation

2. Partially eclipsed conformation

3. Gauche conformation

4. Staggered conformation

Q.

Energy barrier between staggered and eclipsed conformation of ethane is?

1. 0.6K Cal/ mole

2. 2.9 K Cal/ mole

3. 12 K Cal/ mole

4. 16 K Cal/ mole

Q. What is staggered conformation?

1. The conformation in which atoms have the least separation between them.
2. The conformation in which the atoms have maximum separation between them and torsional angle is 60°
3. The conformation where the atoms have minimum separation between them and the torsional angle is between 60° - 120°
4. The conformation in which have maximum separation between them and the torsional angle is 180°

Q. In the given conformation $C_2$ is rotated about $C_2$-$C_3$ bond anticlockwise by an angle of ${120}^{\circ }$ then the conformation obtained is

1. Fully eclipsed conformation
2. Partially eclipsed conformation
3. Gauche conformation
4. Staggered conformation

Q.

The most stable conformation of ethane is

1. Staggered

2. Eclipsed

3. Neither a nor b

4. Both a and b

Q. Which of the following sawhorse representation is correct for the given newman projection?

1. 
2. 
3. 
4. 

Q. The $O-N-O$ angle is maximum in:

1. $HN{O}_3$
2. $N{O}_2^{+}$
3. $HN{O}_2$
4. $N{O}_2$

Q. Choose the correct statement for the following newman projection of n-butane :

1. It is an eclipsed conformation
2. It is an anti (staggered) conformation.
3. It is a skew conformation.
4. None of the above