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Test: Reaction Intermediate Level - 2 - Chemistry MCQ


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30 Questions MCQ Test Organic Chemistry - Test: Reaction Intermediate Level - 2

Test: Reaction Intermediate Level - 2 for Chemistry 2024 is part of Organic Chemistry preparation. The Test: Reaction Intermediate Level - 2 questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Reaction Intermediate Level - 2 MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Reaction Intermediate Level - 2 below.
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Test: Reaction Intermediate Level - 2 - Question 1

The increasing order of stability of the following free radicals is .

Detailed Solution for Test: Reaction Intermediate Level - 2 - Question 1

Radical is stabilized by α hydrogen. More the α-hydrogen more will be hyperconjugation more will be radical stabilization resonance. 

Resonance is also a good stabilizing factor and is given preference than hyperconjugation.

Test: Reaction Intermediate Level - 2 - Question 2

  For the following compounds, which nitrogen is the least tendency to be protonated:

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Test: Reaction Intermediate Level - 2 - Question 3

 Which one among the following carbocations has the longest half-life?

Detailed Solution for Test: Reaction Intermediate Level - 2 - Question 3

Higher the stability of cation more will be its half-life. As, in the carbocation, p orbital overlap with the compound, will be more stabilizing factor than aromaticity.

Test: Reaction Intermediate Level - 2 - Question 4

The major product formed in the following reaction is:

Test: Reaction Intermediate Level - 2 - Question 5

 Hyperconjugation is best described as:
 

Test: Reaction Intermediate Level - 2 - Question 6

 The acidity for the following compounds increases in the order:

CH3​CH2​CH(Br)COOH, CH3CH(Br)CH2​COOH, (CH3​)2CHCOOH

Detailed Solution for Test: Reaction Intermediate Level - 2 - Question 6

a. EWG ( e−− withdrawing groups) increases the acidic strength, whereas EDG ( e−− donating groups) decrease the acidic strength.

b. Nearer is the EWG to the source [(−COOH)group], stronger is the acid, i.e., α− substituted halo acid stronger than β−orγ− substituted halo acid.
Increasing order of acidic strength:
(III)<(II)<(I).

Test: Reaction Intermediate Level - 2 - Question 7

A compound  shows a large dipole moment. Which of the following resonance structures
can be used to adequately explain this observation:

Detailed Solution for Test: Reaction Intermediate Level - 2 - Question 7

Both (IV) and (III) member ring are aromatic due to charge separation
in case of IV member ring total 6 electron and 3 member ring 2 electron are present
according to 4n+2 rule they are aromatic
and all the carbon are sp2 hybridize

Test: Reaction Intermediate Level - 2 - Question 8

 The acidity of the protons H:

Test: Reaction Intermediate Level - 2 - Question 9

Which of the following is not a valid resonance structure of the others:
 

Test: Reaction Intermediate Level - 2 - Question 10

 Which allylic carbocation is the most stable carbocation:
 

Test: Reaction Intermediate Level - 2 - Question 11

 Which among the following carbocations is most stable:
 

Test: Reaction Intermediate Level - 2 - Question 12

Which of the following statements about resonance structures is false?

Test: Reaction Intermediate Level - 2 - Question 13

Which of the following carbocations is the most stable?

Detailed Solution for Test: Reaction Intermediate Level - 2 - Question 13

Concept:

  • An organic compound having a positive charge on the carbon atom and six valence electrons is known as carbocation.
  • Carbocations may be formed by the attack of a positively charged species on an unsaturated molecule.
  • Carbocations may be classified as primary, secondary, and tertiary.
  • Methyl carbocation having only one carbon is an exception.
  • The positively charged carbon in the carbocation is sp2 hybridized.
  • The three hybrid orbitals are used to form bonds with three other atoms.
  • The carbocation has a planar structure. 

Explanation:

  • Carbocations are highly reactive and are used up as soon as they are generated in the reaction process.
  • The relative order of their stabilities are:

Test: Reaction Intermediate Level - 2 - Question 14

 Which of the following is not a resonance structure of the others:
 

Detailed Solution for Test: Reaction Intermediate Level - 2 - Question 14

As from IMAGE 01 it is clear that here IMAGE 02 is not a resonance structure of others.

Test: Reaction Intermediate Level - 2 - Question 15

Rank of the following three compounds in decreasing order of basicity is:

Test: Reaction Intermediate Level - 2 - Question 16

The strength of the following bases decreases in the order: 

Test: Reaction Intermediate Level - 2 - Question 17

 Choose the following species that would be predicted to be aromatic according to Huckel’s rule:

Test: Reaction Intermediate Level - 2 - Question 18

Which of the following phenol would be the most acidic:
 

Test: Reaction Intermediate Level - 2 - Question 19

 Which is an acceptable resonance structure for the following drawing:

Test: Reaction Intermediate Level - 2 - Question 20

The reaction of (+) 2-iodobutane and Nal* in acetone was studied by measuring the rate of incorporation of I* (ki) and the rate of racemisation(kr)

(+) CH3CH(I)CH2CH3 + Nal* → CH3CH(I*)CH2CH3 + Nal

For this reaction, the relationship between kr and ki is

Detailed Solution for Test: Reaction Intermediate Level - 2 - Question 20

The given reaction is : (+)CH3CH(I)CH2CH3 + Nal* → CH3CH(I*)CH2CH3 + Nal

This is an example of an SN2 type reaction.

  • SN2 reaction involves the product formation with inversion of configuration. When one molecule of the original substances undergoes inversion, one molecule of product is formed with inversion of configuration.
  • This trier that when one original optically active molecule undergoes inversion, the inverted product and another origins, optically active molecules lose their optical activity due to the occurrence of racemisation i.e. when one molecule is inverted, actually two molecules are racemised.
  • Hence, it can be concluded that the rate of racemisation is double to the rate of inversion. Hence, mathematically, 2ki = kr
Test: Reaction Intermediate Level - 2 - Question 21

 Alkyne hydrogens are more acidic than alkene or alkane hydrogens because:

Test: Reaction Intermediate Level - 2 - Question 22

Which of the following is expected to be the least basic?
 

Test: Reaction Intermediate Level - 2 - Question 23

The acidity order for the following compound follows the order:

Test: Reaction Intermediate Level - 2 - Question 24

 The acidity of the protons H in each of the following is:

Test: Reaction Intermediate Level - 2 - Question 25

 Identify correct acidic strength order in the following compounds:

Detailed Solution for Test: Reaction Intermediate Level - 2 - Question 25

Correct Answer :- C

Explanation : The correct option is A. Since −OE+ which increases the acidity of the compound and is distance dependent. In I −OE+ group is nearer to the substituents. So, its more acidic than the other two. SO the correct order will be i>ii>iii.

Test: Reaction Intermediate Level - 2 - Question 26

Identify correct acidic strength order in the following compounds:

Test: Reaction Intermediate Level - 2 - Question 27

Identify correct acidic strength order in the following compounds:

Test: Reaction Intermediate Level - 2 - Question 28

 Identify the correct acidic strength order in the following compounds:

Test: Reaction Intermediate Level - 2 - Question 29

 Identify correct acidic strength order in the following compounds:

Test: Reaction Intermediate Level - 2 - Question 30

 Identify correct acidic strength order in the following compounds:

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