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Organic Chemistry – Some Basic Principles and Techniques · Question 44

AIPMT 2012 (Prelims)MCQEasy📈 Topic in 12% papers+4−1
1

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

Answer

(1) Br-CH2-CH=CH2 1-Bromoprop-2-ene

Solution

As per IUPAC rules, the multiple bond (functional feature) gets the lowest locant before the substituent.

3CH2(Br)- 2CH= 1CH2 3-Bromoprop-1-ene (not 1-bromoprop-2-ene).

(2) Longest chain of 6 C, numbered from the right: Br and CH3 at C-4, CH3 at C-2 4-Bromo-2,4-dimethylhexane (correct).

(3) 5 C chain, CH3 at C-2, C6H5 at C-3 2-Methyl-3-phenylpentane (correct).

(4) COOH carbon is C-1, keto group at C-5 5-Oxohexanoic acid (correct).

Answer: (1)

AIPMT 2012 (Prelims)

Keep practising — Organic Chemistry – Some Basic Principles and Techniques

2

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

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

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
AIPMT 2011 (Prelims)
4

Which of the following species is not electrophilic in nature?

  1. Cl
  2. BH3
  3. H3 O
  4. NO2
AIPMT 2010 (Mains)
5

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
AIPMT 2010 (Mains)
6

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2010 (Prelims)
7

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.
AIPMT 2009
8

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
AIPMT 2009
9

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)
AIPMT 2008
10

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2008
11

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)
AIPMT 2008

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