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MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - JEE MCQ


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20 Questions MCQ Test - MCQ (Previous Year Questions) - Organic Chemistry (Level 2)

MCQ (Previous Year Questions) - Organic Chemistry (Level 2) for JEE 2024 is part of JEE preparation. The MCQ (Previous Year Questions) - Organic Chemistry (Level 2) questions and answers have been prepared according to the JEE exam syllabus.The MCQ (Previous Year Questions) - Organic Chemistry (Level 2) MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for MCQ (Previous Year Questions) - Organic Chemistry (Level 2) below.
Solutions of MCQ (Previous Year Questions) - Organic Chemistry (Level 2) questions in English are available as part of our course for JEE & MCQ (Previous Year Questions) - Organic Chemistry (Level 2) solutions in Hindi for JEE course. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free. Attempt MCQ (Previous Year Questions) - Organic Chemistry (Level 2) | 20 questions in 40 minutes | Mock test for JEE preparation | Free important questions MCQ to study for JEE Exam | Download free PDF with solutions
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 1
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Which of the following hydrocarbons has the lowest dipole moment?            [JEE-2002]

MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 2
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Which of the following acids has the smallest dissociation constant ?                 [JEE-2002]

Detailed Solution for MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 2
The acidity increases with the increase in electronegativity of the halogen present.
Smallest dissociation constant means weakest acid, which is BrCH2 CH2OOH because here Br (less electronegative than F ) is two carbon atoms away from –COOH.
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MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 3
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Which of the following represent the given mode of hybridisation sp2 – sp2 – sp – sp from left to right?            [JEE-2003]

MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 4
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Maximum dipolemoment will be of            [JEE-2003]
Detailed Solution for MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 4
-This is due to in CH3Cl chlorine is EWG and it is in one direction and no other group present for cancelling/decreasing its dipole moment. 2- In CH2Cl2 dipole moment of H-H atoms and Cl-Cl atoms do not cancel each other because angle are not 180 deg so they are not linear. 3- In CCl4 dipole moment cancel and become zero because angle between trans position of Cl atom is 180deg.
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 5
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Product (A). The product A will be                      [JEE-2003]
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 6
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                    [JEE-2004]

Correct order of acidic strength is
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 7
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                   [JEE-2005]
Detailed Solution for MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 7
The H atom of SO3H will get attached to CH3COONA and will become CH3COOH and this will get attached to benzene ring and the SO3Na will also formed
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 8
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For 1-methoxy-1,3-butadiene, which of the following resonating structure is the least stable ?       [JEE-2005]
Detailed Solution for MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 8

There is no conjugation stability, two double bonds are together and -ve charge & lone pair (on oxygen) are also together in option C

Also carbon having + charge form more than 4 bonds, thus breaking the rule of tetra-valancy.

Hence C

MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 9
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When benzene sulfonic acid and p-nitrophenol are treated with NaHCO3, the gases released respectively are [JEE-2006]
Detailed Solution for MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 9
Co2. 
because they are acids and any acid releases co2 from bicarbonates.
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 10
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(I) 1, 2 - dihydroxy beznene
(II) 1, 3 - dihydroxy benzene
(III) 1, 4 - dihydroxy benzene
(IV) Hydroxy benzene
The increasing order of boiling points of above mentioned alcohols is               [JEE-2006]
Detailed Solution for MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 10
(c) Among the given compounds, hydroxybenzene (IV) has least molar mass and therefore posses least boiling point. Among the three isomeric dihydroxybenzenes, 1,2- dihydroxybenzene (I) forms intramolecural H-bonding with the result it will not form intermolecular H-bonding leading to lowest boiling point. On the other hand 1,3-dihydroxybenzene (II) and 1,4-dihyroxybenzene (III)do not undergo chelation, hence they will involve extensive intermolecular H-bonding leading to higher boiling point. Further intermolecular hydrogen bonding is stronger in the p-isomer than the m-isomer hence former has highest b.p. Thus the deacreasing order of boiling points is III > II > I >IV.
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 11
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Among the following, the least stable resonance structur is                     [JEE-2007]
Detailed Solution for MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 11

Hence (A) is correct
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 12
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Statement-1: p-Hydroxybenzoic acid has a lower boiling point then o-hydroxybenzoic acid.


Statement-2: o-Hydroxybenzoic acid has a intramoleculer hydrogen bonding.             [JEE-2007]
Detailed Solution for MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 12
As the number of hydrogen bonding increases the boiling point increases. In p hydroxy benzoic acid more hydrogen bonds can be formed as both carboxylic group and hydroxyl group forms intermolecular hydrogen bonding but in o hydroxy benzoic acid intramolecular hydrogen bonding thus number of hydrogen bonding decreases thus boiling point decreases that is its boiling point is lower than p hydroxy benzoic acid . Thus statement 1 is false but statement 2 is true.
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 13
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Hyperconjugation involves overlap of the following orbitals                [JEE-2008]
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 14
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The correct stability order for the following species is                    [JEE-2008]
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 15
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The correct acidity order of the following is                      [JEE-2009]

                          

                             

 

 
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 16
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The correct stability order of the following resonance structures is                [JEE-2009]

 
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 17
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In the following carbocation; H/CH3 that is most likely to migrate to the positively charged carbon is [JEE-2009]
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 18
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Among the following compounds, the most acidic is:                   [JEE-2011]

Detailed Solution for MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 18
Ortho-isomer, a strong hydrogen bridge can be formed between the phenolic -OH and the the carboxylate anion. This will tend to stabilize the conjugated carboxylate base, and hence will increase acidity.

this is the order of acidic

ortho hydroxy B.acid > meta hydroxy B.acid > benzoic acid > para hydroxy B. acids.
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 19
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In Allen (C3H4), the type (s) of hybridisation of the carbon atoms is (are)              [JEE-2012]
Detailed Solution for MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 19
In allene we can tell hybridization separately for different c-atom not of the the molecule .The two c atom H2-c=c=c-H2 at terminal have sp2 while the middle have sp .
MCQ (Previous Year Questions) - Organic Chemistry (Level 2) - Question 20
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Which of the following molecules in pure from is (are) unstable at room temperature                  [JEE-2012]
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