Bromination

Q. Give name of the reagent to bring about the following transformation:

$A$: Hexan-1-ol to hexanal

$B$: Cyclohexanol to cyclohexanone

$C$: p-fluorotoluene to p-fluorobenzaldehyde

$D$: Ethanenitrile to ethanal

$E$: Allyl alcohol to propenal

$F$: But-2-ene to ethanal

Q.
The number of possible monobromo products is: (excluding stereoisomers)

1. 8
2. 4
3. 10
4. 5

Q.

Why does the reactivity of nitrogen differ from phosphorus?

Q. For the given reaction :



$\stackrel{\bullet }{B}r$ will abstract which of the hydrogen most readily ?

1. Hydrogen (a)
2. Hydrogen (b)
3. Hydrogen (c)
4. Hydrogen (d)

Q. Find the major product in the following reaction.

1. 
2. 
3. 
4. 

Q. Which of the following alkane ( having molecular weight = 86) on bromination gives only two monobromo derivatives (excluding stereoisomers) ?

1. 
2. 
3. 
4. 

Q. Among the following free radical bromination reaction(s), the reactions in which $2^{\circ }$ halide is a major product is/are :

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

Q.

The major product formed in the above reaction is :

1. 
2. 
3. 
4. 

Q.

Consider the following reaction:

Identify the structure of the major product X.

1. 
2. 
3. 
4. 

Q. Which is the major monobromination product when ethylcyclohexane is subjected to free radical bromination?

1. 
2. 
3. 
4. 

Q. When butene-1 is mixed with excess of bromine, the expected reaction product is

1. 1, 2-dibromobutane
2. 1, 1-dibromobutane
3. 2, 2-dibromobutane
4. Perbromobutane

Q. Among the given free radical bromination reactions, the reaction(s) in which $3^{\circ }$ halide is a major product is /are :

1. 
2. 
3. 
4. 

Q. In an $S_{N}2$ reaction on chiral centres, there is:

1. Inversion more than retention leading to partial racemisation
2. $100\%$ retention
3. $100\%$ inversion
4. $100\%$ racemisation

Q. For the given reaction :


Number of possible monobromo products (excluding stereoisomers) are :

Q. In which of the following pairs, the bromination of first member is easier than the second member?

1. Isobutane, n - butane
2. n - Butane, Isobutane
3. Methane, Ethane
4. None of these

Q. When a chiral alkyl halide undergoes a $S_{N}1$ reaction, a racemic mixture is formed.

1. True
2. False

Q. In which of the following pairs, the rate of bromination of first member is more than the second member?

1. Isobutane, n-butane
2. n-butane, isobutane
3. Methane, ethane
4. None of these

Q. Which of the following compound gives only one monochloro product on its chlorination in presence of sunlight?

1. n-butane
2. Isopentane
3. Neopentane
4. Isobutane

Q. Which of the following can decolourise bromine water?

1. $C_6{H}_{10}$
2. $C_4{H}_6$
3. $C_2{H}_4$
4. All of the above

Q. Arrange the following alkanes in the increasing order of their boiling point:
pentane, hexane, $2-3-$$dimethyl-butane$

1. none of the above
2. $pentane<2,3-dimethylbutane<hexane$
3. $hexane<2,3-dimethylbutane<pentane$
4. $pentane<hexane<2,3-dimethylbutane$

Q. Which of the following carbocation/s is/are more stable than benzyl carbocation?

1. 
2. 
3. 
4. 

Q. How many Grignard react with alcohol to give n-butane? (Excluding stereoisomer)

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

Q. Who gives valance bond theory?

Q. How zaitsevs rule is applied to 3-bromo heptane?

Q. The reaction condition leading to the best yield of $C_2{H}_{5}Cl$ is:

1. $C_2{H}_6\left(\text{excess}\right)+C{l}_2\stackrel{\text{UV light}}{\to }$
2. $C_2{H}_6+C{l}_2\text{(excess)}\underset{\text{room temp.}}{\overset{\text{dark}}{\to }}$
3. $C_2{H}_6+C{l}_2\text{(excess)}\stackrel{\text{UV light}}{\to }$
4. $C_2{H}_6+C{l}_2\stackrel{HCl}{\to }$

Q. Identify the major product.

1. 
2. 
3. 
4. 

Q. The reaction condition leading to the best yield of $C_2{H}_{5}Cl$ is:

1. $C_2{H}_6\left(\text{excess}\right)+C{l}_2\stackrel{\text{UV light}}{\to }$
2. $C_2{H}_6+C{l}_2\text{(excess)}\underset{\text{room temp.}}{\overset{\text{dark}}{\to }}$
3. $C_2{H}_6+C{l}_2\text{(excess)}\stackrel{\text{UV light}}{\to }$
4. $C_2{H}_6+C{l}_2\stackrel{HCl}{\to }$

Q. 2-Methylbutane on reacting with bromine in the presence of sunlight gives mainly

1. 1-bromo-2-methylbutane
2. 2-bromo-2-methylbutane
3. 2-bromo-3-methylbutane
4. 1-bromo-3-methylbutane

Q. In the following monobromination reaction, the number of possible chiral product(s) is (are):

Q. Which one is not the interfering radical?

1. $B{O}_3^{3-}$
2. $F^{-}$
3. $P{O}_4^{3-}$
4. $S{O}_4^{2-}$