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Organic Chemistry – Some Basic Principles and Techniques · Question 53

AIPMT 2008MCQEasy📈 Topic in 0% papers+4−1
1

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

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

Answer

(1) [figure]

Solution

Reactivity towards electrophilic attack increases with the electron density in the ring.

–OH (phenol) is a strongly activating group: it donates electrons to the ring by +R effect, so the ring becomes highly electron-rich.

–Cl deactivates the ring (–I > +R); –NO2 strongly deactivates it (–I and –R); –CH2OH is attached through CH2, so the O lone pair cannot enter the ring by resonance (weak –I effect).

As per NCERT, the –OH group attached to the benzene ring activates it towards electrophilic substitution.

∴ Phenol is the most reactive towards electrophilic attack.

Answer: (1)

AIPMT 2008

Keep practising — Organic Chemistry – Some Basic Principles and Techniques

2

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
3

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
4

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-
AIPMT 2007
5

Consider the following compounds (i) C6H5COCl (ii) [figure] (iii) [figure] (iv) [figure] The correct decreasing order of their reactivity towards hydrolysis is

  1. (i) > (ii) > (iii) > (iv)
  2. (iv) > (ii) > (i) > (iii)
  3. (ii) > (iv) > (i) > (iii)
  4. (ii) > (iv) > (iii) > (i)
AIPMT 2007
6

The general molecular formula, which represents the homologous series of alkanols is

  1. CnH2nO
  2. CnH2nO2
  3. CnH2n+2O
  4. CnH2n+1O
AIPMT 2006
7

The IUPAC name of [figure] is

  1. 1-chloro-1-oxo-2, 3-dimethylpentane
  2. 2-ethyl-3-methylbutanoyl chloride
  3. 2, 3-dimethylpentanoyl chloride
  4. 3, 4-dimethylpentanoyl chloride.
AIPMT 2006
8

The general molecular formula, which represents the homologous series of alkanols is

  1. CnH2n+2O
  2. CnH2nO2
  3. CnH2nO
  4. CnH2n+1O
AIPMT 2006
9

Names of some compounds are given. Which one is not in IUPAC system?

  1. CH3-CH2-CH2- CH2CH3 |CH- CH3 |CH-CH2CH3 3-Methyl-4-ethylheptane
  2. CH3- OH |CH- CH3 |CH-CH3 3-Methyl-2-butanol
  3. CH3-CH2- CH2 \|C- CH3 |CH-CH3 2-Ethyl-3-methylbut-1-ene
  4. CH3-C C-CH(CH3)2 4-Methyl-2-pentyne
AIPMT 2005
10

Which amongst the following is the most stable carbocation?

  1. CH3
  2. CH3 CH2
  3. CH3- CH3 | CH
  4. CH3- CH3 | CH3 | C
AIPMT 2005
11

Name of the compound given below is [figure]

  1. 4-ethyl-3-methyloctane
  2. 3-methyl-4-ethyloctane
  3. 2,3-diethylheptane
  4. 5-ethyl-6-methyloctane
AIPMT 2003

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