Test: Organic Reaction Mechanism & Methods of Purification (September 17) - NEET MCQ

Heterolytic fission, also known as heterolysis, is a type of bond fission in which a covalent bond between two chemical species is broken in an unequal manner, resulting in the bond pair of electrons being retained by one of the chemical species (while the other species does not retain any of the electrons from the bond pair). When a neutrally charged molecule undergoes heterolytic fission, one of the products will have a positive charge whereas the other product will have a negative charge.

The three CH₃ radicals attached to the positively charged carbon are electron repelling group. Therefore, these CH₃ radicals exhibit +I effect (Inductive effect) and repel electrons towards the positively charged Carbon. This decreases the positive charge and makes the compound more stable.

The correct answer is option B
Electron poor species are stabilized by neighboring atoms that can donate electron density. The most common way to interpret rich neighbors here is the observation that increasing the number of alkyl groups on the carbon bearing the free radical increases its stability. 
Radical stability increases in the order methyl < primary < secondary < tertiary.
 

Carbon atoms with its sextet are called carbocation. It is an electron deficient species.

In heterolytic bond cleavage the bond breaks unevenly and the shared pair of electrons is accommodated by one of the products, which produces one or more ions.As heterolytic bond cleavage gives ions. So the reaction which proceeds through heterolytic bond cleavage is an ionic reaction.

Hence B is the correct answer.

The correct answer is Option A.
 
Steam distillation is used to separate organic compounds that tend to decompose at high temperature. Essential oils can be purified by steam distillation.

Sublimation is a process of changing solid to gas and vice-versa. And when naphthalene changes into gas then impure substance would be left.