Elimination Reactions of Alkyl Halides

Q.

Allyl chloride on dehydrochlorination gives

1. Allyl alcohol

2. Acetone

3. Propadiene

4. Propylene

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. Reactivity of alkyl halides towards dehydrohalogenation reaction is

1. 3⁰ > 1⁰ > 2⁰
2. 3⁰ > 2⁰ > 1⁰
3. 2⁰ > 1⁰ > 3⁰
4. 1⁰ > 2⁰ > 3⁰

Q.

By which mechanism does the above reaction proceed ?

1. α-elimination

2. β-elimination

3. γ-elimination

4. δ-elimination

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. The reaction is known as

1. Wurtz reaction
2. Fitting reaction
3. Wurtz-Fitting reaction
4. Freund 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.

Among the following the most reactive towards alcoholic KOH is :

1. CH₂ = CHBr

2. CH₃COCH₂CH₂Br

3. CH₃CH₂Cl

4. CH₃CH₂Br

Q.

If the structure of alkyl halide during dehydrohalogenation reaction is such that it can undergo H-elimination from two different sites, then the more highly substituted alkene is the major product. This generalization is known as

1. Racemization

2. Markownikoff's Rule

3. Saytzeff's Rule

4. Kharasch's effect

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