Which of the following compounds undergoes nucleophilic substitution reaction most easily?

1.		2.
3.		4.

Consider the reactions:

\(C_6H_5CH_2Br \xrightarrow[2.~H_3O^+] {1.Mg,Ether}~\mathrm X, \)
The product 'X' in the above reaction is:
1. \(\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{OH} \)
2. \(\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_3 \)
3. \(\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{C}_6 \mathrm{H}_5 \)
4. \(\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{OCH}_2 \mathrm{C}_6 \mathrm{H}_5\)

Which of the following undergoes nucleophilic substitution exclusively by S_N1 mechanism?

1. Ethyl chloride

2. Isopropyl chloride

3. Benzyl chloride

4. Chlorobenzene

The –OH group of an alcohol or the carboxylic acid can be replaced by – Cl using: 

Given below is a reaction sequence:
\(\begin{aligned} & CH_3CH_2Cl\xrightarrow{NaCN}X\xrightarrow{H_2/Ni}Y\\ &Y\xrightarrow{\text{Acetic Anhydride}}Z \end{aligned}\)

Z in the above reaction is:

1. CH₃CH₂CH₂NHCOCH₃

2. CH₃CH₂CH₂NH₂

3. CH₃CH₂CH₂CONHCH₃

4. CH₃CH₂CH₂CONHCOCH₃

obtained by chlorination of n-butane, will be:
1.  Meso form
2.  Racemic mixture
3.  d-form
4.  l-form

An organic compound A$\left(C_4{H}_{9}Cl\right)$ in reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative. A is:

1. t-butyl chloride
2. sec. butyl chloride
3. Iso butyl chloride
4. n-butyl chloride

A compound that does not undergo S_N1 reaction with OH^- is:

1.		2.
3.		4.

Find the correct sequence of the bond enthalpy of the "C-X" bond among the following:

1. CH₃-F < CH₃-Cl > CH₃-Br > CH₃-I

2. CH₃-Cl > CH₃-F > CH₃-Br > CH₃-I

3. CH₃-F < CH₃-Cl < CH₃-Br < CH₃-I

4. CH₃-F > CH₃-Cl > CH₃-Br > CH₃-I