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


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

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Test: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 1

 Heterolytic cleavage is a way to cleave the:

Detailed Solution for Test: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 1

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: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 2

 Which of the following ions is most stable?   

Detailed Solution for Test: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 2

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.

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Test: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 3

Which of the following free radical is the most stable :

Detailed Solution for Test: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 3

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: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 4

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

Detailed Solution for Test: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 4

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

Test: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 5

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

Detailed Solution for Test: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 5

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.

Test: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 6

 How are essential oils purified?

Detailed Solution for Test: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 6

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.

Test: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 7

 Pick the odd one out:

Test: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 8

Separation of mixture into a column of adsorbent is known as:

Test: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 9

This method is used to purify liquids having very high boiling points and those, which decompose at or below their boiling points.

Test: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 10

 Impure sample of Naphthalene can be purified by:

Detailed Solution for Test: Organic Reaction Mechanism & Methods of Purification (September 17) - Question 10

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

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