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Haloalkanes and Haloarenes · Question 25

AIPMT 2010 (Mains)MCQEasy📈 Topic in 25% papers+4−1
1

In the following reaction C6H5CH2Br [2. H3O+]1. Mg, ether X, the product 'X' is

  1. C6H5CH2OCH2C6H5
  2. C6H5CH2OH
  3. C6H5CH3
  4. C6H5CH2CH2C6H5

Answer

(3) C6H5CH3

Solution

Step 1: C6H5CH2Br + Mg dry ether C6H5CH2MgBr

Step 2: C6H5CH2MgBr + H2O H+ C6H5CH3 + Mg(OH)Br

∵ As per NCERT, Grignard reagents react with any source of proton to give hydrocarbons.

∴ X = toluene, C6H5CH3

Answer: (3)

AIPMT 2010 (Mains)

Keep practising — Haloalkanes and Haloarenes

2

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

  1. X = Benzal chloride, Y = o-chlorotoluene
  2. X = m-chlorotoluene, Y = p-chlorotoluene
  3. X = o- and p-chlorotoluene, Y = Trichloromethyl benzene
  4. X = Benzyl chloride, Y = m-chlorotoluene
AIPMT 2010 (Prelims)
3

Which one is most reactive towards SN1 reaction?

  1. C6H5CH(C6H5)Br
  2. C6H5CH(CH3)Br
  3. C6H5C(CH3)(C6H5)Br
  4. C6H5CH2Br
AIPMT 2010 (Prelims)
4

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

  1. I < II < IV < III
  2. II < III < I < IV
  3. IV < III < I < II
  4. III < II < I < IV
AIPMT 2010 (Prelims)
5

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

  1. 2RX + 2Na R-R + 2NaX
  2. RX + H2 RH + HX
  3. RX + Mg RMgX
  4. RX + KOH ROH + KX
AIPMT 2009
6

Trichloroacetaldehyde, CCl3CHO reacts with chlorobenzene in presence of sulphuric acid and produces

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2009
7

In an SN2 substitution reaction of the type R-Br + Cl- DMF R-Cl + Br- which one of the following has the highest relative rate?

  1. CH3- CH3 | CH3 |C-CH2Br
  2. CH3CH2Br
  3. CH3CH2CH2Br
  4. CH3- CH3 |CH-CH2Br
AIPMT 2008
8

Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?

  1. Ethyl chloride
  2. Isopropyl chloride
  3. Chlorobenzene
  4. Benzyl chloride
AIPMT 2005
9

Which of the following is least reactive in a nucleophilic substitution reaction?

  1. (CH3)3C-Cl
  2. CH2=CHCl
  3. CH3CH2Cl
  4. CH2=CHCH2Cl
AIPMT 2004
10

Chloropicrin is obtained by the reaction of

  1. steam on carbon tetrachloride
  2. nitric acid on chlorobenzene
  3. chlorine on picric acid
  4. nitric acid on chloroform
Out of syllabusAIPMT 2004
11

Reactivity order of halides for dehydrohalogenation is

  1. R-F > R-Cl > R-Br > R-I
  2. R-I > R-Br > R-Cl > R-F
  3. R-I > R-Cl > R-Br > R-F
  4. R-F > R-I > R-Br > R-Cl
AIPMT 2002

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