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31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes


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24 Questions MCQ Test Chemistry 28 Years Past year papers for NEET/AIPMT Class 12 | 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes for NEET 2022 is part of Chemistry 28 Years Past year papers for NEET/AIPMT Class 12 preparation. The 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes below.
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31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 1

Phosgene is a common name for [1988]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 1

Carbonyl chloride (COCl2).

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 2

Which chloro derivative of benzene among the following would undergo hydrolysis most readily with  aqueous sodium hydroxide to furnish the corresponding hydroxy derivative? 

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 2

Cl in 2, 4, 6-trinitrochlorobenzene is activated by three NO2 groups at o, and p-positions and hence undergoes hydrolysis most readily.

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 3

Benzene reacts with n-propyl chlor ide in the presence of anhydrous AlCl3 to give [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 3


                                    
                                 Isopropyl benzene

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 4

Industrial preparation of chloroform employs acetone and [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 4

By distilling ethanol or acetone with a paste of bleaching powder (laboratory and commercial method).

Cl2, so obtained acts as a mild oxidising as well as chlorinating agent

(a) 

(b) 

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 5

Chlorobenzene reacts with Mg in dry ether to give a compound (A) which further reacts with ethanol to yield [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 5

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 6

When chlorine is passed through propene at 400°C, which of the following is formed ?[1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 6

At high temp. i.e., 400°C substitution occurs in preference to addition.

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 7

Zerevitinov’s determination of active hydrogen in a compound is based upon its reaction with[1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 7

Number of active hydrogen in a compound corresponds to the number of moles of CH4 evolved per mole of the compound.

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 8

The replacement of chlorine of chlorobenzene to give phenol requires drastic conditions, but the chlorine of 2,4-dinitrochlorobenzene is readily replaced since, [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 8

—NO2 group is electron attractive group, so it is able to deactivate the benzene ring.

hence withdrawl of electrons from ortho & para position cause easy removal of –Cl atom due to development of +ve charge on o- and p positions.

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 9

2-Bromopen tane is heated with potassium ethoxide in ethanol. The major product obtained is[1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 9

Potassium ethoxide is a strong base, and 2-bromopentane is a 2º bromide, so elimination raction predominates

Since trans- alkene is more stable than cis.thus  trans-pentene -2 is the main product.

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 10

 An organic compound A (C4H9Cl) on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative, then  A is [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 10

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 11

 obtained by chlorination of n-butane, will be [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 11

Chlorination of n-butane taken place via free radical formation i.e., 

Cl may attack on either side and give a racemic mixture of 2 chloro butane which contain 50% d form and 50% l-form.

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 12

Reactivity order of halides for dehydrohalogenation is [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 12

The order of atomic size of h alogen s decrease in the order I > Br > Cl > F i.e  on moving down a group atomic size increases. Further the bond length of C-X bond deccreases in the order C – I > C – Br > C – Cl > C – F and hence the bond dissociation energy decreases  in the order R – F > R – Cl > R – Br > R – I hence R – I being a weakest bond break most easily. Hence R – I is most reactive.

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 13

Z in the above reaction sequence is [2002]


Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 13

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 14

When  CH3CH2CHCl2 is treated with NaNH2, the product formed is [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 14

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 15

Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere? [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 15

Chlorofluorocarbons, e.g. CF2Cl2, CHF2Cl2, HCF2CHCl2. These are non-inflammable colour less and stable upto 550ºC. These are emitted as propellants in aerosol spray, cans refrigerators, fire fighting reagents etc. They are chemically inert and hence do not react with any substance with which they come in contact and therefore float through the atmosphere and as a result enter the stratosphere. There theyabsorb UV-rays and due to this they produce free atomic chlorine which results decomposition of ozone which cause depletion of ozone layer.

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 16

Chloropicrin is obtained by the reaction of 

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 16

Chloropicrin is nitrochloroform. It is obtained by the nitration of chloroform with HNO3.

Chloropicrin is a liquids, poisonous and used as an insecticide and a war gas

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 17

In a SN2 substitution reaction of the type             [2008] which one of the following has the highest relative rate ?

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 17

For such a reacti on the rate of S2N substitution reaction is maximum in case of CH3CH2 Br because S2N mech an ism is followed in case of primary and secondary halides i.e., S2N reaction is favoured by small groups on the carbon atom attached to halogens so CH3 CH2 Br > CH3 CH2 CH2 Br >

i.e. option (d) is correct.

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 18

Which of the following reactions is an example of nucleophilic substitution reaction? [2009]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 18

In nucleophilic substitution, a nucleophile provides an electron pair to the substrate and the leaving group departs with an electron pair.

These are usually written as SN (S stands for substitution and N for nucleophilic) and are common in aliphatic compounds especially in alkyl halides and acyl halides.

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 19

Benzene reacts with CH3Cl in the presence of anhydrous AlCl3 to form: [2009]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 19

Friedel Craft’s reaction.

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 20

Trichloroacetaldehyde, CCl3CHO reacts with chlorobenzene in presence of  sulphuric acid and pr oduces: [2009]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 20

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 21

The reaction of toluene with Cl2 in presence of FeCl3 gives ' X' and reaction in presence of light gives ‘Y’. Thus, ‘X’ and ‘Y’ are : [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 21

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 22

Which one is most reactive towards SN1 reaction ?

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 22

SN1 reactions involve the formation of carbocations, hence higher the stability of carbocation, more will be reactivity of the parent alkyl halide. Thus tertiary carbocation formed from (c) is stabilized by two phenyl groups and one methyl group, hence most stable.

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 23

Consider the reactions : [2011 M]


                               

                            

The mechanisms of reactions (i) and (ii) are respectively :

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 23

Positive charge will be on the Carbon with 1o in Both Examples
as order of Reaction for SN2 is 1o > 2o >> 3o
So, Answer is  SN2 and SN2

31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 24

Number of isomeric alcohols of molecular formula C6H14O which give positive iodoform test is [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Haloalkanes & Haloarenes - Question 24

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