Test: Preparation and Properties of Monohalides - JEE MCQ

Compound which are mirror image of each other and are non superimposable are termed as enantiomers.

These are enantiomers

The correct answer is Option A
Least hindered halides give the fastest SN₂ reaction as the hindrance increases. As the hindrance increases, the occurrence of SN₂ reaction decreases.

The elimination reaction (dehydrohalogenation)
is favoured by those substrates that form a more stable carbocation intermediate.
Thus, the order of reactivity will be :-

We must know that the Haloalkane in the presence of alcoholic undergoes elimination reactions. For example:

Alcoholic potassium hydroxide, solution that functions as solvent gives alkoxide ions that act as a strong base. This base abstracts -Hydrogen atom from saturated substrate - alkyl halide.
Abstracted -Hydrogen atom is then transferred to the alkyl part to form an alkane and simultaneously a molecule of is eliminated.
The basicity of hydroxide ions is considerably lower than the basicity of alkoxide ions. Hydroxide ion is significantly getting hydrated in aqueous solution. Hence, hydroxide ions cannot abstract -hydrogen atoms of alkyl chloride to eliminate and form alkene.

The correct option is B Inversion of configuration.

Here inversion of configuration occurs.