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Organic Chemistry – Some Basic Principles and Techniques

AIPMT 2003MCQEasyNot asked in last 5 yrs+4−1
Ques. 1AIPMT 2003

Which one of the following orders of acid strength is correct ?

  1. RCOOH > ROH > HOH > HC CH
  2. RCOOH > HOH > ROH > HC CH
  3. RCOOH > HOH > HC CH > ROH
  4. RCOOH > HC CH > HOH > ROH

Answer

(2) RCOOH > HOH > ROH > HC CH

Solution

Acid strength depends on the stability of the conjugate base.

RCOO- is stabilised by resonance (charge spread over two O atoms) RCOOH is the strongest acid.

The alkyl group (+I effect) increases the electron density on O in RO-, RO- is less stable than HO- HOH > ROH.

As per NCERT, alcohols are weaker acids than water, and water is a stronger acid than ethyne (HC C- carries the charge on the less electronegative sp carbon).

RCOOH > HOH > ROH > HC CH

Answer: (2)

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Ques. 2AIPMT 2003

Which one of the following is a free-radical substitution reaction ?

  1. [figure]
  2. [figure]
  3. [figure]
  4. CH3CHO + HCN CH3CH(OH)CN
Ques. 3AIPMT 2002

IUPAC name of the following is CH2=CH-CH2-CH2-C CH

  1. 1-hexyne-5-ene
  2. 1,5-hexenyne
  3. 1-hexene-5-yne
  4. 1,5-hexynene
Ques. 4AIPMT 2002

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

  1. resonating structures
  2. tautomers
  3. geometrical isomers
  4. optical isomers
Ques. 5AIPMT 2001

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
Ques. 6AIPMT 2001

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
Ques. 7AIPMT 2000

Which is maximum stable?

  1. 1-Butene
  2. cis-2-Butene
  3. trans-2-Butene
  4. All have same stability.
Ques. 8AIPMT 2000

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

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