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Test: Reaction Mechanism - NEET MCQ


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10 Questions MCQ Test - Test: Reaction Mechanism

Test: Reaction Mechanism for NEET 2024 is part of NEET preparation. The Test: Reaction Mechanism questions and answers have been prepared according to the NEET exam syllabus.The Test: Reaction Mechanism MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Reaction Mechanism below.
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Test: Reaction Mechanism - Question 1

 In a free radical reaction, free radicals are formed at

Detailed Solution for Test: Reaction Mechanism - Question 1


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

Test: Reaction Mechanism - Question 2

 The observed order of the stability of the cabocation is:

Detailed Solution for Test: Reaction Mechanism - Question 2

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)

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Test: Reaction Mechanism - Question 3

 Heterolytic cleavage is a way to cleave the:

Detailed Solution for Test: Reaction Mechanism - Question 3

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.

Test: Reaction Mechanism - Question 4

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:

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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.
 

Test: Reaction Mechanism - Question 5

 Which of the following ions is most stable?   

Detailed Solution for Test: Reaction Mechanism - Question 5

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.

Test: Reaction Mechanism - Question 6

 Which among the following is a very unstable and reactive species:

Detailed Solution for Test: Reaction Mechanism - Question 6

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

Test: Reaction Mechanism - Question 7

Which of the following free radical is the most stable :

Detailed Solution for Test: Reaction Mechanism - Question 7

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.
 

Test: Reaction Mechanism - Question 8

A carbon species carrying a negative charge on carbon atom is known as:

Detailed Solution for Test: Reaction Mechanism - Question 8

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.

Test: Reaction Mechanism - Question 9

A species having a carbon atom possessing a sextet of electrons and a positive charge is called as:

Detailed Solution for Test: Reaction Mechanism - Question 9

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

Test: Reaction Mechanism - Question 10

The organic reaction which proceeds through heterolytic bond cleavage are known as:

Detailed Solution for Test: Reaction Mechanism - Question 10

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.

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