Elimination Reactions of Alkyl Halides

Q. A mixture of 1-chloropropane and 2-chloropropane when treated with alcoholic KOH gives

1. 2- Propene
2. Isopropylene
3. 1-Propene
4. A mixture of 1-propene and 2-propene

Q.

Why dry ether medium is needed for the Wurtz reaction?

Q. 1-Phenyl-2-chloropropane when treated with alcoholic KOH gives.... as the major product

1. 1-Phenylpropene
2. 3-Phenylpropene
3. 1-Phenyl-2-propanol
4. Carbylamine reaction

Q.

How does ammonia react with a solution of Cu²⁺?

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

1. 2 – bromo – 3 methyl butane
2. 1 – bromo – 3 methyl butane
3. 1 – bromo – 2 – methyl butane
4. 2 – bromo – 2 methyl butane

Q.

Write the reaction of ethene with hydrogen.

Q.

The reagent for the above conversion is

1. Alcoholic KOH

2. Alcoholic KOH followed by NaNH₂

3. Aqueous KOH followed by NaNH₂

4. Zn/ CH₃COOH

Q.

Why are interhalogen compounds more reactive than Halogens?

Q. Phosgene is a common name for:

1. Carbonyl dichloride
2. Carbonyl tetrachloride
3. Phosphoryl chloride
4. Carbonyl trichloride

Q.

Write the following reaction of ethene:

Hydrogenation

Q.

Nucleophilic substitution and elimination reactions of alkyl halides oftenly compete each other, elimination reactions are favoured under which condition.

1. By carrying out the reaction at high temperature

2. By using sterically hindered nucleophile

3. By using strong but slightly polarizable base

4. All the above three

Q.

2-Phenyl-2-chloropropane on treatment with alc.KOH gives mainly:

1. 2-Phenylpropene

2. 3-Phenylpropene

3. 1-Phenylpropan-2-ol

4. 1-Phenylpropan-3-ol

Q. In which of the following cases, Hoffmann product is the major product?

1. 
2. 
3. 
4. 

Q. A dihalogen derivative ‘X’ of a hydrocarbon with three carbon atoms in a molecule, reacts with alc. KOH giving another hydrocarbon which gives red precipitates with ammonical CuCl. ‘X’ gives an aldehyde when treated with aqueous KOH. The compound ‘X’ is

1. 1, 2-Dichloropropane
2. 2, 2-Dichloropropane
3. 1, 1-Dichloropropane
4. 1, 3-Dichloropropane

Q. Bicyclohexane was found to undergo parallel first order reactions at 730K to form cyclohexane and methyl cyclopentene. Rate constant for the formation of cyclohexane was 1.26×10^-4 /s andfor the formation of methyl cyclopentene was 3.8×10^-5/sec . Fraction of cyclohexane in the product is ?

Q.

During debromination of meso-2, 3-dibromobutane, the major compound formed is

1. N-butane

2. Trans-2-butene

3. 1-butene

4. Cis-2-butene

Q. Dehalogenation of meso-2, 3-dibromo-butane results in

1. cis-2-Butene
2. trans-2-Butene
3. n-Butane
4. A mixture of cis-and trans-2-Butene

Q. What is the product formed when sodium tert-butoxide reacts with bromoethane?

Q. Which one of the following will give racemised product in $C_2{H}_{5}OH$ ?

1. 
2. 
3. 
4. 

Q.

State the condition required for the reactions of Catalytic hydrogenation of ethene.

Q. When Grignard reagent is added to α, β- unsaturated ketone , is 1, 4-addition product obtained as major product

Q. The following reaction is described as

1. $S_{N}2$
2. $S_{N}i$
3. $S_{E}2$
4. $S_{N}1$

Q. Which statement is true about $S_{N}2$ mechanism?

1. The rate of reaction increases on increasing the strength of nucleophile.
2. The reaction is faster in polar aprotic solvents.
3. The rate of reaction increases as the leaving group ability increases.
4. All of the above.

Q.

A substance that is produced by a chemical reaction is called a _______. (reactant/ product)

Q.
Number of compounds which can give Haloform reaction, is:

Q.

Allyl chloride on dehydrochlorination gives

1. Allyl alcohol

2. Acetone

3. Propadiene

4. Propylene

Q. The best method of preparation of alkyl halides is:

1. $ROH+HCl$
2. $ROH+PC{l}_5$
3. $ROH+SOC{l}_2$
4. $ROH+PC{l}_3$

Q. Chloroform on heating with silver powder gives

1. Acetylene
2. Methane
3. Ethylene
4. Nitroethane

Q.

Product "x" major will be

1. 

2. 

3. 

4. 

Q. Total number of peptide bond(s) in the following molecule is: