2nd Year Chemistry Chapter 9 Test09. Halogenoalkanes

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Chlorobenzene undergoes which type of reaction?
   1. Nucleophilic substitution
   2. Electrophilic substitution
   3. Elimination reaction
   4. Hydrolysis
2. Tertiary alkyl halides in presence of weak bases give mostly:
   1. SN2 products
   2. SN1 and E1 products
   3. E2 products only
   4. Addition products
3. E2 reaction is favored by:
   1. Weak bases
   2. Strong bases
   3. Polar protic solvents
   4. Carbocation stabilizers
4. The reactivity of haloalkanes is mainly influenced by:
   1. Type of solvent
   2. Type of halogen atom
   3. Presence of oxygen
   4. Temperature
5. The stability order of carbocations is:
   1. 1° > 2° > 3°
   2. 3° > 2° > 1° > methyl
   3. Methyl > 1° > 2° > 3°
   4. 2° > 1° > 3°
6. Alkyl halides generally have _______ melting and boiling points as compared to alkanes.
   1. Lower
   2. Equal
   3. Higher
   4. Zero
7. SN2 mechanism shows:
   1. Retention of configuration
   2. Inversion of configuration
   3. No stereochemical change
   4. Racemization
8. In alkyl halides, the alkyl halide molecule is polarized because:
   1. Halogen is more electronegative than carbon
   2. Carbon is more electronegative than halogen
   3. Both have same electronegativity
   4. No polarity exists
9. Which solvent favors E2 mechanism?
   1. Polar protic solvent
   2. Polar aprotic solvent
   3. Non-polar solvent
   4. Aromatic solvent
10. Why is the C–Cl bond in chlorobenzene difficult to break?
    1. Because of weak attraction
    2. Because of strong resonance
    3. Because of steric hindrance
    4. Because of high electronegativity of carbon