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Organic Chemistry – Some Basic Principles and Techniques · Question 45

AIPMT 2011 (Prelims)MCQEasy📈 Topic in 0% papers+4−1
1

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

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

Answer

(2) [figure]

Solution

Each compound has a -CH3 group; the reactivity towards an electrophile depends on the second group.

-OH: strong +R effect (lone pair on O delocalised into the ring) strongly activating.

-OCH3: +R effect, but slightly weaker than -OH.

-NHCOCH3: the lone pair on N is also delocalised over the C=O group only moderately activating.

-CH2OH: no lone pair on the atom attached to the ring only weakly activating (like an alkyl group).

Electron density in the ring is highest in o-cresol (2-methylphenol), so it is the most reactive towards electrophiles.

Answer: (2)

AIPMT 2011 (Prelims)

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2

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)
3

Which of the following species is not electrophilic in nature?

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

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)
5

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2010 (Prelims)
6

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
7

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
8

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
9

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2008
10

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
11

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
AIPMT 2008

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