Classification of Organic Halogen Compounds

Which of the following compounds will give racemic mixture on nucleophilic substitution by OH- ion?

1. \[\begin{array}{cc}\ce{CH3 - CH - CH2Br}\\
   |\phantom{....}\\\ce{C2H5}\end{array}\]
2. \[\begin{array}{cc}\ce{CH3}\\
   |\phantom{.}\\\ce{H3C - C - C2H5}\\
   |\phantom{.}\\\ce{Br}\end{array}\]
3. \[\begin{array}{cc}\ce{H}\\
   |\phantom{.}\\\ce{CH3 - C - C2H5}\\
   |\phantom{.}\\\ce{Cl}\end{array}\]

The treatment of ethyl formate with excess of RMgX gives

The carbocation formed in SN¹ reaction of alkyl halide in the slow step is ______.

The raw material for Raschig process

Which alkyl halide from the following pair is

1. chiral
2. undergoes faster S_N2 reaction?

Complete the following reaction.

\[\ce{C6H5Cl + Mg ->[THF]}\]

Complete the following reaction.

\[\ce{CHCl3 + HNO3 ->[\Delta]}\]