Newman Projection

Q. Which of the following is a conformer of 2-methylpentane?

1. 
2. 
3. 
4. None of the above

Q. Which of the following is/are correct representation(s) for 2, 3-dimethylpentane?

1. 
2. 
3. 
4. 

Q. In the following skew conformation of ethane, $H^{\prime }-C-C-H^{\prime \prime }$ dihedral angle is

1. ${58}^o$
2. ${149}^o$
3. ${151}^o$
4. ${120}^o$

Q. In the Newman projection formula of the least stable eclipsed form of $n-$butane, which of the following reasons is the cause of its unstability?

1. Due to it low energy
2. Torsional strain
3. Combination of both
4. None of these

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

1. 
2. 
3. 
4. 

Q. Which of the following is the staggered conformation for rotation about $C_1$ and $C_2$ bond in the following structure?

1. 
2. 
3. 
4.