Nucleophilic Substitution in Alkyl Halides

Q. The rate of $S_{N}2$ reaction is maximum when the solvent is

1. Benzene
2. DMSO
3. CH₃OH
4. H₂O

Q.

Which one of the following compounds cannot be made from bromoethane in a single reaction?

1. C₂H₅CN

2. C₂H₅OH

3. C₂H₅NH₂

4. C₃H₇NH₂

Q. The correct order of increasing reactivity C- X bond towards nucleophile in the following in the following compounds is:

(AIPMT - 2010)

1. $II<III<I<IV$
2. $IV<III<I<II$
3. $I<II<IV<III$
4. $III<II<I<IV$

Q. Which of the following is the correct order of $S_{N}2$ decreasing reactivity?

1. 
2. 
3. 
4. 

Q.

Addition of KI accelerates the hydrolysis of primary haloalkanes because

1. KI is soluble in organic solvent

2. I^- is a strong base

3. I^-is a weak base and a poor leaving group

4. I^- is a powerful nucleophile as well as a good leaving group

Q.

Which of the following ether will always give SN_2 mechanism in acidic as well as basic conditions ?

1. 

2. 

3. All

4. 

Q.

Which of the following undergoes nucleophilic substitution exclusivelyby S_N1 mechanism?

1. Benzyl chloride

2. Ethyl chloride

3. Isopropyl chloride

4. Chlorobenzene

Q.

Which of the following alkyl halides is used as a methylating agent?

1. C₂H₅Cl

2. C₂H₅Br

3. C₆H₅Cl

4. CH₃I

Q. Arrange the following: $C{H}_{3}C{H}_{2}C{H}_{2}C{H}_{2}Cl$ (I), $C{H}_{3}C{H}_{2}CHCl-C{H}_3$ (II), $(C{H}_3{)}_{2}CHC{H}_{2}Cl$ (III) and $(C{H}_3{)}_{3}C-Cl$ (IV) in order of decreasing tendency towards $S_{N}2$ reaction

1. I > III > II > IV
2. II > I > III > IV
3. IV > III > II > I
4. III > IV > II > I

Q.

The reaction R - Br + NaCN → R-CN + NaBr, is an example of

1. Electrophilic substitution

2. Oxidation - reduction

3. Nucleophitic Substitution

4. Elimination reaction