Conformations of Butane

Q. In the following, the most stable conformation of n-butane is:

1. 
2. 
3. 
4. 

Q. Choose the incorrect statement(s) among the following:

1. There are only six conformers for n-butane
2. The keto form of acetylacetone in n-hexane is stable than the enol form
3. The gauche form of ethylene glycol is more stable
4. 8 isomers are possible for $C_4{H}_6$

Q. is the most stable conformation of butane.

1. Gauche form
2. Anti form
3. Eclipsed form
4. Fully eclipsed form

Q. Which of the following conformers for ethylene glycol is most stable?

1. 
2. 
3. 
4. 

Q. A Fischer projection of (2R, 3S)-2, 3-butanediol is:

1. 
2. 
3. 
4. 

Q. Which is the lowest energy conformation of butane?

1. 
2. 
3. 
4. 

Q. Sort the following butane conformations according to stability.

1. Anti form
2. Fully eclipsed
3. Partial eclipsed
4. Gauche form

Q.

What would you call this conformation of butane?

1. Chair

2. Boat

3. Totally eclipsed

4. Partially eclipsed

5. Gauche

6. Anti

Q. Choose the incorrect statement(s) among the following:

1. There are only six conformers for n-butane
2. The keto form of acetylacetone in n-hexane is stable than the enol form
3. The gauche form of ethylene glycol is more stable
4. 8 isomers are possible for $C_4{H}_6$

Q. The number of geometrical isomers of $C{H}_3-CH=CH-CH=CH-CH=CHCl$ are:

1. 4
2. 6
3. 8
4. 2

Q.

1. True
2. False

Q.

In the above compound, $C_2$ is rotated clockwise ${120}^{\circ }$ about $C_2-C_3$ bond. The resulting conformer is:

1. Partially eclipsed

2. Eclipsed

3. Gauche

4. Staggered

Q. The bond order in $O_2^{-}$ ion is:

1. 2
2. 1
3. 2.5
4. 1.5

Q. Which of the following statement(s) is/are correct regarding Hinsberg's test?

1. It is used to distinguish aliphatic and aromatic primary amines
2. It is used to distinguish primary and secondary amines
3. It is used to distinguish primary and secondary alcohols
4. Both (b) and (c)

Q. Which of the following isomeric structure have lowest energy?

1. 
2. 
3. 
4. 

Q. $C_2$ is rotated anti-clockwise ${180}^o$ about $C_2-C_3$ bond. The resulting conformer is
$C_2$ is at the front and $C_3$ at the rear.

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

Q. Which is more stable among 2-methyaniline and 3-methylaniline? Why?

Q.
$C_2$ is rotated ${120}^{\circ }$ clockwise about $C_2-C_3$ bond. The resulting conformer becomes:

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

Q. The double bond in aldehydes and ketones is reactive towards nucleophilic reagents like CN - whereas that in an alkene is not.

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. Anti

Q.

Column I (Compound)

Column II (Relative configuration)

Q. Which of the following conformers for ethylene glycol is most stable?

1. 
2. 
3. 
4. 

Q. The increasing order of $p{K}_a$ value of the following is:
(i) $CH\equiv CH$
(ii) and (iii) ref. image

1. $III>I>II$
2. $II>I>III$
3. $I>III>II$
4. $I>II>III$

Q. Arrange pentan-1-ol, n-butane, pentanal , ethoxyethane in order of their increasing boiling points?

Q.

why is butanol more soluble in water as compared to butanamine?

Q. Compare the stability of the following compounds:

1. $C^{+}{H}_2-C{F}_3$
2. $C^{+}{H}_2-CC{l}_3$
3. $C^{+}{H}_2-CB{r}_3$
4. $C^{+}{H}_3$