Wurtz Halide Reaction

Q. How to convert ethane to bromoethane

Q. Na, dry ether is used as a reducing agent in which of the following reaction?

1. Catalytic hydrogenation
2. Kolbe's electrolysis
3. Soda lime process
4. Wurtz reaction

Q.

$H_{2}S$ acts only as a reducing agent while $S{O}_2$ can act both as a reducing and oxidizing agent because

1. S in H2S has - 2 oxidation state

2. S in SO2has oxidation state + 4

3. Hydrogen in H₂S more +ve than oxygen

4. Oxygen is more - ve in SO2

Q.

Which one of the following reactions is most suitable for the preparation of n-propyl benzene

1. Friedel-Craft's reaction

2. Wurtz reaction

3. Wurtz-Fittig reaction

4. Grignard reaction

Q. An oxidising agent or oxidant is that substance which undergoes reduction in a chemical reaction

1. True
2. False

Q.

Which of the following is the strongest oxidising agent

1. 

2. 

3. 

4. 

Q. To prepare a pure sample of n-hexane using sodium metal as one reactant, the other reactant will be

1. n-propyl bromide
2. Ethyl bromide and n-butyl bromide
3. Ethyl chloride and n-butyl chloride
4. Methyl bromide and n -pentyl chloride

Q.

Which of the following behaves as both oxidising and reducing agents

1. H₂SO₄

2. SO₂

3. H₂S

4. HNO₃

Q.

The reaction of 1 - bromo - 3 - chloro cyclo butane with metallic sodium in dioxane gives

1. 

2. 

3. 

4. 

Q. Addition of $HBr$ to propene yields $2$-bromopropane, while in the presence of benzoyl peroxide, the same reaction yields $1$ - bromopropane. Explain and give mechanism.

Q. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{Br}+{\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{Br}\stackrel{\mathrm{Na}/\mathrm{dry}\mathrm{ether}}{\to }\mathrm{The}\mathrm{product}/s\mathrm{formed}\mathrm{are}$

1. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_3$
2. $H_{2}C={\mathrm{CH}}_2$
3. ${\mathrm{CH}}_3-{\mathrm{CH}}_3$
4. All

Q. Select the incorrect statement A. Boron tribromide is stronger lewis acid than boron trifluoride B. Borax has two tetrahedral and two triangular units C. B2H6.2NH3 considered as ionic product D.When diborane with excess of NH3 mixture is heated at high temperature Borazole is formed

Q.

Which of the following is the most powerful oxidizing agent

1. F2

2. Cl2

3. Br2

4. I2

Q.

Equation $H_{2}S+H_2{O}_2\to S+2H_{2}O$ represents

1. Acidic nature of H₂O₂

2. Basic nature of H₂O₂

3. Reducing nature of H₂O₂

4. Oxidising nature of H₂O₂

Q. Product(s) which cannot be obtained from the above reaction is/are : :

1. 
2. 
3. 
4. All products can be obtained.

Q. Wurtz reaction using bromoethane yields:

1. 2-bromobutane
2. n-butane
3. isobutane
4. ethane

Q. When isobutyl magnesium bromide in dry ether is treated with absolute ethyl alcohol, the products formed are

1. $C{H}_3-CH-C{H}_{2}OHandC{H}_{3}C{H}_{2}MgBr|C{H}_3$
2. $C{H}_3-CH-C{H}_2-C{H}_2-C{H}_{3}andMg\left(OH\right)Br|C{H}_3$
3. $C{H}_3-CH-C{H}_{3}andC{H}_3-C{H}_{2}OMgBr|C{H}_3$
4. $C{H}_3-CH-C{H}_3,C{H}_2=C{H}_{2}andMg\left(OH\right)Br|C{H}_3$

Q. Methane reacts with chlorine in the presence of sunlight. Which of the following reactions are related?

1. $C{H}_4+C{l}_2\stackrel{Sunlight}{\to }C{H}_{3}Cl+HCl$
2. $C{H}_{3}Cl+C_2\stackrel{Sunlight}{\to }C{H}_{2}C{l}_2+HC$
3. $C{H}_{2}C{l}_2+C{l}_2\stackrel{Sunlight}{\to }CHC{l}_3+HCl$
4. $CHC{l}_3+C{l}_2\stackrel{Sunlight}{\to }CC{l}_4+HCl$

Q. By Wurtz reaction, a mixture of methyliodide and ethyliodide gives

1. Butane
2. Ethane
3. Propane
4. A mixture of the above three

Q. which among the following is not obtained when ethyl chloride and n-propyl chloride undergoes wurtz reaction ?

1. n–butane
2. n–pentane
3. n–hexane
4. isobutane

Q. which among the following is not obtained when ethyl chloride and n-propyl chloride undergoes wurtz reaction ?

1. n–butane
2. n–pentane
3. n–hexane
4. isobutane

Q.

State what do you observe when Ethene is bubbled through a solution of Bromine in Carbon tetrachloride.

Q.

Balance the following redox reactions by ion exchange method briefly .

1. Cr(OH)₄^- +H₂O₂ --> CrO₄^2- + H₂O (Basic Medium)
2. MnO₄^- + C₂H₂O₄ --> Mn²⁺ + CO₂ + H₂O ( Acidic Medium)

Q. cannot be prepared by wurtz reaction.

1. Methane
2. Ethane
3. Butane

Q.

1-bromo-3-chlorocyclobutane when treated with two equivalents Na, in the presence of ether, which of the following will be formed?

1. 
2. 
3. 
4. 

Q. The product(s) obtained in the above Wurtz reaction is/are:

1. 
2. 
3. 
4. Both (a) and (b)

Q. Which one of the following alkylbromide may be used to prepare 2, 3-dimethylbutane by wurtz reaction?

1. n-propyl bromide
2. isopropyl bromide
3. isobutyl bromide
4. s-butyl bromide

Q.

Alkanes could be synthesized by:

1. Wurtz reaction

2. Decarboxylation reaction

3. Reduction of an alkyl halide

4. All of the above

Q. What is enthalpy of a reaction?.

Q. The compound formed when ethene reacts with Hydrogen is _______. $(C{H}_4,C_2{H}_6,C_3{H}_8)$.