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Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - JEE MCQ


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30 Questions MCQ Test Chapter-wise Tests for JEE Main & Advanced - Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique

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Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 1

Read the following Statement-1(Asseration)  and Statement -2 (Reason) and answer as per the options given below :

Q. 

Statement -1: Aryl halides undergo nucleophilic substitution with ease.

Statement -2:The carbon-halogen bond in aryl halides has partial double bond character.

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 1

Statement -1 is false beca use aryl halides do not undergo nucleophilic substitution under ordinary conditions. This is due to resonance, because of which the carbon–chlorine bond acquires partial double bond character, hence it becomes shorter and stronger and thus cannot be replaced by nucleophiles.

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 2

Statement -1: Phenol is more reactive than benzene towards electrophilic substitution reactions.

Statement-2:In the case of phenol, the intermediate carbocation is  more resonance stabilized.

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 2

its in termediate carbocation is more stable than the one in benzene.

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Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 3

Statement -1: Molecules that are not superimpossable on their mirror images are chiral.

Statement -2: All chiral molecules have chiral centres.

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 3

Statement-1 is correct. Statement-2 is incorrect because compound can be chiral even in the absence of chiral atoms.

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 4

Arrangement of (CH3)3C –, (CH3)2CH –, CH3 – CH2 – when attached to benzyl or an unsaturated group in increasing order of inductive effect is

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 4

–CH3 group has + I effect , as number of –CH3 group increases, the inductive effect increases.
Therefore the correct order is

CH3– CH2– < (CH3)2CH– < (CH3)3C –

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 5

A similarity between optical and geometrical isomerism is that

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 5

Sterioisomerism involve those isomers which contain same ligands in their co-ordination spheres but differ in the arrangement of these ligands in space. Stereoisomerism is of two type geomerical isomerism and optical isomerism. In geomerical isomerism ligands occupy different positions around the central metal atom or ion.

NOTE : In optical isomerism isomers have same formula but differ in their ability to rotate directions of the plane of polarised light.

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 6

Which of the following does not show geometrical isomerism?

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 6

 does not show geometrical isomerism due to presence of two similar Cl atoms on the same C-atom. Geometrical isomerism is shown by compounds in which the groups/atoms attached to C = C are different.

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 7

The functional group, which is found in amino acid is

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 7

Amino acids contain – NH2 and – COOH groups e.g

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 8

Which of the following compounds has wrong IUPAC name?

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 8

The correct name is 3 - methylbut - 2 - ol

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 9

The IUPAC name of CH3COCH(CH3), is

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 9

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 10

In which of the following species is the underlined carbon having sp3 hybridisation?

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 10

In molecules (a), (c) and (d), the carbon atom has a multiple bond, only (b) has sp3 hybridization.

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 11

Racemic mixture is formed by mixing two 

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 11

A mixture of equal amount of two enantiomers is called a racemic mixture. A racemic mixture does not rotate plane– polarized light. They are optically inactive because for every molecule in a racemic mixture that rotate plane of polarized light in one direction, there is a mirror image molecule that rotates the plane in oppsite direction.

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 12

Following types of compounds (as I, II)

are studied in terms of isomerism in:

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 12

TIPS/Formulae : Stereoisomerism is of two types i.e., geometrical isomerism and optical isomerism
Both the structures shows sterioisomerism. Structure I shows geometrical isomerism as it contains two different atoms(H) and groups (CH3) attached to each carbon containing double bond.

Structure II shows optical isomerism as it contains a chiral carbon (attached to four different group) atom.

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 13

The reaction:

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 13

The hydrolysis of t-butyl bromide is an example of SN1 reaction. The reaction consists of two steps.

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 14

In the anion HCOO the two carbon-oxygen bonds are found to be of equal length. what is the reason for it ?

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 14

The anion HCOO has two resonating structures in which double bond occurs on both xygen atoms. So, the bond length of both the CO bonds is equal.

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 15

The general formula CnH2nO2 could be for open chain

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 15

CnH2nO2 is general formula for carboxylic acid

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 16

Among the following four structures I to IV,


it is true that

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 16

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 17

Which one of the following has the minimum boiling point ?

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 17

NOTE : Among isomeric alkanes, the straight ch ain isomer has higher boiling point than the branched chain isomer. The greater the branching of the chain, the lower is the boiling point. Further due to the presence of π electrons, these moleculs are slightly polar and hence have higher boiling points than the corrosponding alkanes.
Thus B.pt. follows the order alkynes > alkene > alkanes (straight chain) > branched chain alkanes.

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 18

The IUPAC name of the compound is 

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 18

IUPAC name –  3, 3-Dimethyl -1 cyclohexanol

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 19

Which one of the following does not have sp2 hybridized carbon ?

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 19


Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 20

Which of the following will have a mesoisomer also?

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 20

NOTE : The compounds containing two similar assymmetric C-atoms have plane of symmetry and exist in Meso form.

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 21

Rate of the reaction

is fastest when Z is

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 21

Cl is the best leaving group among the given option.

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 22

Amongst the following compounds, the optically active alkane having lowest molecular mass is

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 22

Only 2- cylcopropyl butane has a chiral centre.

 

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 23

Consider the acidity of the carboxylic acids :

(a) PhCOOH

(b) o-NO2C6H4COOH

(c) p-NO2C6H4COOH

(d) m-NO2C6H4COOH

Which of the following order is correct ?

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 23

In aroma tic acids presence of electron withdrawing substituent e.g. –NO2 disperses the negative charge of the anion and stablises it and hence increases the acidity of the parent benzoic acid.
Further o-isomer will have higher acidity than corresponding m and p isomers. Since nitro group at p-position have more pronounced electron withdrawing than –NO2 group at m-position hence the correct order is the one given above.

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 24

Which of the following is the strongest base ?

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 24

Lone pair of electrons present on the  nitrogen of  benzyl amine is not involved  in resonance

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 25

Which of the following compounds is not chiral?

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 25

1-chloropentane is not chiral while others are chiral in nature


Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 26

Due to the presence of an unpaired electron, free radicals are:

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 26

Free radicals are electrically neutral, unstable and very reactive on account of the presence of odd electrons.

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 27

The decreasing order of nucleophilicity among the nucleophiles

(B) CH3O-

(C) CN-   

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 27

In moving down a group, the basicity and nucleophilicity are inversely related, i.e. nucleophilicity increases while basicity decreases. In going from left to right across a period, the basicity and nucleophilicity are directly related. Both of the characteristics decrease as the electronegativity of the atom bearing lone pair of electrons increases. If the nucleophilic centre of two or more species is same, nucleophilicity parallels basicity, i.e. more basic the species, stronger is its nucleophilicity.
Hence based on the above facts, the correct order of nucleophilicity will be

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 28

The reaction

is fastest when X is

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 28

when X is Cl the C–X bond is more polar and  ionic which leaves the compound more reactive for nucleophilic substitution reaction.

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 29

The IUPAC name of the compound shown below is :

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 29

Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 30

The increasing order of stability of the following free radicals is

Detailed Solution for Test: JEE Main 35 Year PYQs- Organic Chemistry Some Basic Principles & Technique - Question 30

The order of stability of free radicals

The stabilisation of first two is due to resonance and last two is due to inductive effect.

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