Test: Reaction Mechanism - NEET MCQ

Here, we can see that in the initiation and termination step, radical is formed.

Alkyl groups directly attached to the +vely charged carbon stabilize the carbocations due to inductive and hyperconjugation effects.
Inductive effect:
→ Stability of carbocation 
→ More number of +I group more stable carbocation.

Hyperconjugation:

Stability 
∝Number of canonical structures
              ∝Number of H (alpha hydrogen)

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 correct answer is option A
Reaction mechanism: A sequential account of each step, describing details of electron movement, energetics during bond cleavage and bond formation, and the rates of transformation of reactants into products (kinetics) is referred to as reaction mechanism.
 

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.

Carbocation is most reactive as it lacks electrons. So it need an electron to attain stability.

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.
 

A carbanion has a negatively charged, trivalent carbon atom that has eight electrons in its valence shell. Thus, a carbanion is not electron deficient. As a result, carbanions have pyramidal geometry. Carbocations, radicals, and carbanions can be stabilized by resonance.

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.