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Organic Chemistry – Some Basic Principles and Techniques · Question 67

AIPMT 2002MCQEasy📈 Topic in 0% papers+4−1
1

CH2- O \|C-CH3 and CH2= O |C-CH3 are

  1. resonating structures
  2. tautomers
  3. geometrical isomers
  4. optical isomers

Answer

(1) resonating structures

Solution

In both structures every atom (C, H, O) occupies the same position; only the electrons (the lone pair and the π electrons) are placed differently.

CH2- O \|C-CH3 CH2= O |C-CH3

As per NCERT, structures that differ only in the position of electrons (not of atoms) are resonance structures (canonical structures).

Tautomers differ in the position of an atom (usually H), so they are not tautomers.

Answer: (1)

AIPMT 2002

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2

The incorrect IUPAC name is

  1. CH3- O \|C- CH3 |CH-CH3 2-methyl-3-butanone
  2. CH3- CH3 |CH- CH2CH3 |CH-CH3 2,3-dimethylpentane
  3. CH3-C CCH(CH3)2 4-methyl-2-pentyne
  4. CH3 Cl |CH Br |CHCH3 2-bromo-3-chlorobutane
AIPMT 2001
3

The correct acidic order of the following is [figure]

  1. I > II > III
  2. III > I > II
  3. II > III > I
  4. I > III > II
AIPMT 2001
4

Which is maximum stable?

  1. 1-Butene
  2. cis-2-Butene
  3. trans-2-Butene
  4. All have same stability.
AIPMT 2000
5

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
AIPMT 2000

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