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Organic Chemistry – Some Basic Principles and Techniques · Question 71

AIPMT 2000MCQMedium📈 Topic in 0% papers+4−1
1

Polarisation in acrolein can be described as

  1. + CH2=CH- + CHO
  2. - CH2=CH- + CHO
  3. - CH2=CH-CH + O
  4. + CH2=CH-CH - O

Answer

(4) + CH2=CH-CH - O

Solution

Acrolein is CH2=CH-CH=O, a conjugated system in which the C=O group withdraws π-electrons (−R effect).

Resonance: CH2=CH-CH=O CH2-CH=CH- O

∵ The more electronegative oxygen takes the π-electron pair, the terminal CH2 carbon becomes electron-deficient.

∴ Polarisation: partial positive charge on CH2 and partial negative charge on O, i.e. + CH2=CH-CH - O

Answer: (4)

AIPMT 2000

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2

The correct IUPAC name of the following compound is : [figure]

  1. 3-ethyl-5-methylheptane
  2. 3-methyl-5-ethylheptane
  3. 2,4-diethylhexane
  4. 3,5-diethylhexane
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3

The following carbocation is stabilized by the interaction of the empty p orbital with [figure]

  1. empty * and empty * orbitals
  2. filled and filled orbitals
  3. empty and empty * orbitals
  4. empty * and filled orbitals
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4

Arrange the following compounds in the increasing order of polarity A. CH3CH2OCH2CH3 B. CH3CH2OH C. CH3COCH3 D. CH3COOH Choose the correct answer from the options given below.

  1. A < C < B < D
  2. A < B < C < D
  3. C < A < D < B
  4. C < A < B < D
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5

Among the given compounds I-III, the correct order of bond dissociation energy of C-H bond marked with * is : [figure]

  1. III > II > I
  2. II > III > I
  3. II > I > III
  4. I > II > III
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6

The most stable carbocation among the following is :

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

A compound with a molecular formula of C6H14 has two tertiary carbons. Its IUPAC name is :

  1. n-hexane
  2. 2-methylpentane
  3. 2,3-dimethylbutane
  4. 2,2-dimethylbutane
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8

The correct IUPAC name of the compound [figure] is :

  1. 4-ethyl-1-fluoro-2-nitrobenzene
  2. 4-ethyl-1-fluoro-6-nitrobenzene
  3. 3-ethyl-6-fluoro-1-nitrobenzene
  4. 1-ethyl-4-fluoro-3-nitrobenzene
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9

Methyl group attached to a positively charged carbon atom stabilizes the carbocation due to

  1. -I inductive effect
  2. electromeric effect
  3. hyperconjugation
  4. mesomeric effect
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10

The number of bonds, bonds and lone pair of electrons in pyridine, respectively are:

  1. 12, 3, 0
  2. 11, 3, 1
  3. 12, 2, 1
  4. 11, 2, 0
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11

Consider the following compounds/species: [figure] The number of compounds/species which obey Hückel's rule is .

  1. 6
  2. 2
  3. 5
  4. 4
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