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Hydrocarbons · Question 39

AIPMT 2012 (Mains)MCQEasy📈 Topic in 12% papers+4−1
1

Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?

  1. NaNH2
  2. HCl
  3. O2
  4. Br2

Answer

(1) NaNH2

Solution

1-Butyne is a terminal alkyne; its C–H hydrogen is acidic (sp carbon). 2-Butyne has no hydrogen on a triple-bonded carbon.

CH3CH2C CH + NaNH2 CH3CH2C C-Na+ + NH3

CH3C CCH3 + NaNH2 no reaction

∴ Sodamide reacts with 1-butyne (liberating NH3) but not with 2-butyne, so it distinguishes them.

HCl and Br2 add to both triple bonds, and O2 burns both, so they cannot distinguish.

Answer: (1)

AIPMT 2012 (Mains)

Keep practising — Hydrocarbons

2

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

  1. benzoic acid
  2. nitrobenzene
  3. toluene
  4. benzene
AIPMT 2012 (Prelims)
3

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

  1. oxidation
  2. cracking
  3. distillation under reduced pressure
  4. hydrolysis
AIPMT 2010 (Prelims)
4

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

  1. chlorobenzene
  2. benzyl chloride
  3. xylene
  4. toluene.
AIPMT 2009
5

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
AIPMT 2009
6

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
AIPMT 2008
7

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)
AIPMT 2007
8

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
AIPMT 2007
9

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
AIPMT 2007
10

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
AIPMT 2006
11

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

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

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