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Organic Chemistry – Some Basic Principles and Techniques

NEET 2013 (Karnataka)MCQEasy📈 Topic in 25% papers+4−1
Ques. 1NEET 2013 (Karnataka)

Which of the following chemical system is non aromatic?

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

Answer

(4) [figure]

Solution

A ring is aromatic when it is cyclic, planar, completely conjugated (every ring atom sp2) and has (4n+2) π electrons (Hückel's rule).

(1) Benzene ⇒ 6 π electrons (n = 1), fully conjugated ⇒ aromatic.

(2) Naphthalene ⇒ 10 π electrons (n = 2), fully conjugated ⇒ aromatic.

(3) Thiophene ⇒ 4 π electrons of the two C=C bonds + one lone pair of S in conjugation = 6 π electrons ⇒ aromatic.

(4) Cyclopenta-1,3-diene ⇒ the CH2 carbon is sp3, so cyclic conjugation is broken ⇒ non-aromatic.

Answer: (4)

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Ques. 2AIPMT 2012 (Prelims)

Which nomenclature is not according to IUPAC system?

  1. Br-CH2-CH=CH2 1-Bromoprop-2-ene
  2. [figure] 4-Bromo-2,4-dimethylhexane
  3. [figure] 2-Methyl-3-phenylpentane
  4. [figure] 5-Oxohexanoic acid
Ques. 3AIPMT 2011 (Prelims)

Which one of the following is most reactive towards electrophilic reagent?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 4AIPMT 2011 (Prelims)

The correct IUPAC name for the compound is [figure]

  1. 4-ethyl-3-propylhex-1-ene
  2. 3-ethyl-4-ethenylheptane
  3. 3-ethyl-4-propylhex-5-ene
  4. 3-(1-ethylpropyl)hex-1-ene
Ques. 5AIPMT 2010 (Mains)

Which of the following species is not electrophilic in nature?

  1. Cl
  2. BH3
  3. H3 O
  4. NO2
Ques. 6AIPMT 2010 (Mains)

The IUPAC name of the compound CH3CH=CHC CH is

  1. pent-4-yn-2-ene
  2. pent-3-en-1-yne
  3. pent-2-en-4-yne
  4. pent-1-yn-3-ene
Ques. 7AIPMT 2010 (Prelims)

Which one of the following is most reactive towards electrophilic reagent?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 8AIPMT 2009

The IUPAC name of the compound having the formula CH C-CH=CH2 is

  1. 1-butyne-3-ene
  2. but-1-yne-3-ene
  3. but-1-en-3-yne
  4. 3-butene-1-yne.
Ques. 9AIPMT 2009

The state of hybridisation of C2, C3, C5 and C6 of the hydrocarbon, [figure] is in the following sequence

  1. sp3, sp2, sp2 and sp
  2. sp, sp2, sp2 and sp3
  3. sp, sp2, sp3 and sp2
  4. sp, sp3, sp2 and sp3
Ques. 10AIPMT 2008

Base strength of [figure] is in the order of

  1. (i) > (iii) > (ii)
  2. (i) > (ii) > (iii)
  3. (ii) > (i) > (iii)
  4. (iii) > (ii) > (i)
Ques. 11AIPMT 2008

Which one of the following is most reactive towards electrophilic attack?

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

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