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Hydrocarbons

AIPMT 2012 (Prelims)MCQEasy📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2012 (Prelims)

Among the following compounds the one that is most reactive towards electrophilic nitration is

  1. benzoic acid
  2. nitrobenzene
  3. toluene
  4. benzene

Answer

(3) toluene

Solution

Electron-donating groups increase the electron density of the ring and activate it towards electrophilic substitution; electron-withdrawing groups deactivate it.

-CH3 (+I effect and hyperconjugation) activating

-COOH, -NO2 (−I and −R effects) deactivating

Reactivity: toluene > benzene > benzoic acid > nitrobenzene.

Answer: (3)

Keep practising — Hydrocarbons

Ques. 2AIPMT 2010 (Prelims)

Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by

  1. oxidation
  2. cracking
  3. distillation under reduced pressure
  4. hydrolysis
Ques. 3AIPMT 2009

Benzene reacts with CH3Cl in the presence of anhydrous AlCl3 to form

  1. chlorobenzene
  2. benzyl chloride
  3. xylene
  4. toluene.
Ques. 4AIPMT 2009

Nitrobenzene can be prepared from benzene by using a mixture of conc. HNO3 and conc. H2SO4. In the mixture, nitric acid acts as a/an

  1. acid
  2. base
  3. catalyst
  4. reducing agent
Ques. 5AIPMT 2008

H3C- CH3 |CH-CH=CH2 + HBr A A (predominantly) is

  1. CH3- Br |CH- CH3 |CH-CH3
  2. CH3- CH3 |CH- Br |CH-CH3
  3. CH3- CH3 |CH-CH2-CH2Br
  4. CH3- Br | CH3 |C-CH2CH3
Ques. 6AIPMT 2007

The order of decreasing reactivity towards an electrophilic reagent, for the following would be (i) benzene (ii) toluene (iii) chlorobenzene (iv) phenol

  1. (ii) > (iv) > (i) > (iii)
  2. (iv) > (iii) > (ii) > (i)
  3. (iv) > (ii) > (i) > (iii)
  4. (i) > (ii) > (iii) > (iv)
Ques. 7AIPMT 2007

Predict the product C obtained in the following reaction of 1-butyne. CH3CH2-C CH + HCl B HI C

  1. CH3-CH2-CH2- Cl | I |C-H
  2. CH3-CH2- I |CH-CH2Cl
  3. CH3CH2- Cl | I |C-CH3
  4. CH3- Cl |CH-CH2CH2I
Ques. 8AIPMT 2007

Which of the compound with molecular formula C5H10 yields acetone on ozonolysis?

  1. 3-Methyl-1-butene
  2. Cyclopentane
  3. 2-Methyl-1-butene
  4. 2-Methyl-2-butene
Ques. 9AIPMT 2006

The correct order regarding the electronegativity of hybrid orbitals of carbon is

  1. sp < sp2 < sp3
  2. sp > sp2 < sp3
  3. sp > sp2 > sp3
  4. sp < sp2 > sp3
Ques. 10AIPMT 2005

Which one of the following alkenes will react faster with H2 under catalytic hydrogenation conditions ?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 11AIPMT 2005

Products of the following reaction : CH3C CCH2CH3 [(ii) hydrolysis](i) O3 are

  1. CH3COOH + CO2
  2. CH3COOH + HOOC.CH2CH3
  3. CH3CHO + CH3CH2CHO
  4. CH3COOH + CH3COCH3

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