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31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - NEET MCQ


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28 Questions MCQ Test Chemistry Class 11 - 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 for NEET 2024 is part of Chemistry Class 11 preparation. The 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 below.
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31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 1

Which of the following compounds will exhibit cis-trans (geometrical) isomerism? [2009]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 1

Alkenes with double bonds cannot undergo free rotation and can have different geometrical shapes with two different groups on each end of the double bond.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 2

Given are cycloh exanol (I) a cetic acid (II), 2, 4, 6 – trinitrophenol (III) and phenol (IV). In these the order of decreasing acidic character will be :[2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 2

https://edurev.gumlet.io/ApplicationImages/Temp/3066490_6f147dd6-4991-4486-bd5d-ccf6220d4e4f_lg.png

Explanation: Presence of three — NO2 groups in o–, p– positions to phenolic groups (in III) makes phenol strongly acidic because its corresponding phenolate ion (conjugate base) is highly stabilized due to resonance.

Conjugate base of CH3COOH, (II) (i.e.CH3COO-) is a resonance hybrid of two equivalent structures.

The conjugate base of phenol, (IV) is stabilized due to resonance note that here all resonating structures are not equivalent).

The conjugate base of cyclohexanol, (I) does not exhibit resonance, hence not formed.

Hence A is the correct answer.

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31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 3

The correct order of increasing reactivity of C – X bond towards nucleophile in the following compounds is: [2010]

(I)            (II)               (III)                    (IV)

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 3

Tertiary alkyl halide is most reactive towards nucleophilic substitution because the corresponding carbocation (3°) is most stable. Aryl halide is least reactive due to partial double bond character of the C – Cl bond.

Presence of — NO2 groups in ortho and para positions  increases the reactivity of the – Cl towards nucleophiles.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 4

Among the given compounds , the most susceptible to nucleophilic attack at the carbonyl group is: [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 4

Cl is the weakest base and hence better leaving group

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 5

Which one is most reactive towards electrophilic reagent? [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 5

Due to +M+M effect of −OH-OH group and hyperconjugation of −CH3-CH3 group.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 6

In the following the most stable conformation of n-butane is: [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 6

The bulky methyl groups are maximum away from each other.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 7

Which of the following conformers for ethylene glycol is most stable? [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 7

Due to hydrogen bonding between the two OH groups, gauche conformation of ethylene glycol (a) is the most stable conformation.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 8

Which of the following species is not electrophilic in nature? [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 8

has a lone pair of electrons on oxygen atom, thus not an electrophile. Also octet is complete.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 9

Which one of the following is most reactive towards electrophilic reagent ? [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 9

Due to +M effect of –OH group and hyperconjugation of –CH3 group.

Both methyl and hydroxyl groups are electron releasing groups hence +I effect increases. Therefore B will be most reactive in an electrophilic reaction.

Hence B is correct.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 10

The correct IUPAC name of the compound

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 10

The given compound is

4 ethyl, 3 propyl hex – 1 – ene

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 11

The correct order of increasing bond length of C – H, C – O, C – C and C = C is : [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 11

Bond length order is

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 12

Which one is a nucleophilic substitution reaction among the following ? [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 12

Because of high electronegativities of the halogen atom, the carbon halogen (C – X) is highly polarised covalent bond. Thus, the carbon atom of the C – X bond becomes a good site for attack by nucleophiles (electron rich species). Nucleophilic substitution reactions are the most common reactions of alkyl halides.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 13

Which of the following compounds undergoes nucleophilic substitution reaction most easily ?

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 13

In SNAr reactions, a carbanion is formed as an intermediate, so any substituent that increases the stability of carbanion and hence the transition state leading to its formation will enhance the SNAr reactions. To compare the rates of substitution in chlorobenzene, chlorobenzene having electron-withdrawing group, and chlorobenzene having electronreleasing group, we compare the structures carbanion I (from chlorobenzene), II (from chlorobenzene containing electron-withdrawing group) and III (from chlorobenzene containing electron-releasing group).

G withdraws electrons, neutralises (disperses) –ve charge of the ring, stabilises carbanion, facilitates SN reaction (activation effect)

G releases electrons, intensifies –ve charge, destabilizes carbanion, retards SN reaction (deactivation) NO2 is activating group and CH3 and OCH3 are deactiving group.
Hence, the correct order of nucleophilic substitution reactions

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 14

The IUPAC name of the following compound is

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 14

Correct IUPAC name of above compound is trans-2-chloro-3-iodo-2-pentene

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 15

In Duma's method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be : (Aqueous tension at 300 K = 15 mm) [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 15

Given wt of compound taken (w) = 0.35 g
Volume of nitrogen collected (V) = 55 ml
Room temperature (t K) = 300 K
Atmospheric pressure (P) = 715 mm Aq. tension (ρ) = 15 mm
Calculation -Volume of N2 at NTP

% of nitrogen

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 16

The Lassaigne’s extract is boiled with conc.HNO3 while testing for halogens. By doing so it [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 16

Conc. HNO3 decomposes NaCN and Na2S to avoid their interference.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 17

 Among the following compounds the one that is most reactive towards electrophilic nitration is: [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 17

Electrophilic rate order

Since nitration is an electrophilic substitution hence presence of electron releasing group like CH3 in the nucleus facilitates nitration.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 18

Which nomenclature is not according to IUPAC system? [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 18

In IUPAC system of nomenclature, preference is given to multiple bond than halogen substituent, so the correct name of

 is 3-Bromoprop-1-ene.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 19

Which of the following acids does not exhibit optical isomerism ? [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 19

It shows geometrical isomerism but does not show optical isomerism.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 20

Structure of the compound whose IUPAC name is 3-ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is : [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 20

IUPAC name of the structure is 3-ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 21

 Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating? [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 21

Decreasing order of deactivating effect of the given  m-directing group is > NO2 > – CN > – SO3H > – COOH
—NO2 group is most deactivating group due to strong – E, – I and – M effects.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 22

Which of the following compounds will not undergo Friedal-Craft’s reaction easily : [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 22

–NO2 is a powerful electron withdrawing group. Its presence on ring makes the ring less active

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 23

 The structure of isobutyl group in an organic compound is : [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 23

  (iso-butyl group)

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 24

Arr ange the following in increasing order of stability [NEET Kar. 2013]


Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 24

Stability depends on number of hyperconjugative structures.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 25

Given

I and II are [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 25

Conformers are form of stereoisomers in which isomers can be interconverted by rotations about single bonds. I and II are staggered and eclipsed conformers respectively.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 26

Homolytic fission of the following alkanes forms free radicals CH3 – CH3, CH3 – CH2 – CH3, (CH3)2 CH – CH3, CH3 – CH2 – CH (CH3)2. Increasing order of stability of the radicals is [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 26

Stability depends on number of hyperconjugative structure.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 27

 What is the hybridisation state of benzyl carbonium   [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 27

In the carbonium ion the carbon atom carrying the positive charge is sp2 hybridized.

31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 28

Nitrogen detection in an organic compound is carried out by Lassaigne’s test. The blue colour formed corresponds to which of the following formulae? [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Some Basic Principles & Techniques - 1 - Question 28

The blue colour is of  Fe4 [Fe(CN)6]3

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