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Organic Chemistry – Some Basic Principles and Techniques

AIPMT 2011 (Prelims)MCQMedium📈 Topic in 12% papers+4−1
Ques. 1AIPMT 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

Answer

(1) 4-ethyl-3-propylhex-1-ene

Solution

The compound is CH2=CH-CH(CH2CH2CH3)-CH(CH2CH3)-CH2CH3.

The parent chain must contain the C=C bond. Two six-carbon chains contain it; choose the one with more substituents.

Parent chain: hex-1-ene (C1=C2), numbered from the double-bond end.

Substituents: propyl at C-3 and ethyl at C-4.

Alphabetical order: ethyl before propyl.

IUPAC name: 4-ethyl-3-propylhex-1-ene

Answer: (1)

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Ques. 2AIPMT 2010 (Mains)

Which of the following species is not electrophilic in nature?

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

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 5AIPMT 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. 6AIPMT 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. 7AIPMT 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. 8AIPMT 2008

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 9AIPMT 2008

The stability of carbanions in the following [figure] is in the order of

  1. (iv) > (ii) > (iii) > (i)
  2. (i) > (iii) > (ii) > (iv)
  3. (i) > (ii) > (iii) > (iv)
  4. (ii) > (iii) > (iv) > (i)
Ques. 10AIPMT 2008

In the hydrocarbon, 6CH3- 5CH= 4CH- 3CH2- 2C 1CH The states of hybridization of carbons 1, 3 and 5 are in the following sequence

  1. sp, sp2, sp3
  2. sp3, sp2, sp
  3. sp2, sp, sp3
  4. sp, sp3, sp2
Ques. 11AIPMT 2007

For (i) I-, (ii) Cl-, (iii) Br-, the increasing order of nucleophilicity would be

  1. Cl- < Br- < I-
  2. I- < Cl- < Br-
  3. Br- < Cl- < I-
  4. I- < Br- < Cl-

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