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Organic Chemistry – Some Basic Principles and Techniques · Question 59

AIPMT 2006MCQEasy📈 Topic in 12% papers+4−1
1

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.

Answer

(3) 2, 3-dimethylpentanoyl chloride

Solution

The principal functional group is the acid chloride (–COCl); its carbon is C-1 of the parent chain.

The longest chain including this carbon has five carbon atoms:

[figure]

Methyl groups are on C-2 and C-3 ⇒ parent: pentanoyl chloride.

∴ IUPAC name: 2,3-dimethylpentanoyl chloride.

Answer: (3)

AIPMT 2006

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2

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

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

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
4

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
5

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
6

Which one of the following orders of acid strength is correct ?

  1. RCOOH > ROH > HOH > HC CH
  2. RCOOH > HOH > ROH > HC CH
  3. RCOOH > HOH > HC CH > ROH
  4. RCOOH > HC CH > HOH > ROH
AIPMT 2003
7

Which one of the following is a free-radical substitution reaction ?

  1. [figure]
  2. [figure]
  3. [figure]
  4. CH3CHO + HCN CH3CH(OH)CN
AIPMT 2003
8

IUPAC name of the following is CH2=CH-CH2-CH2-C CH

  1. 1-hexyne-5-ene
  2. 1,5-hexenyne
  3. 1-hexene-5-yne
  4. 1,5-hexynene
AIPMT 2002
9

CH2- O \|C-CH3 and CH2= O |C-CH3 are

  1. resonating structures
  2. tautomers
  3. geometrical isomers
  4. optical isomers
AIPMT 2002
10

The incorrect IUPAC name is

  1. CH3- O \|C- CH3 |CH-CH3 2-methyl-3-butanone
  2. CH3- CH3 |CH- CH2CH3 |CH-CH3 2,3-dimethylpentane
  3. CH3-C CCH(CH3)2 4-methyl-2-pentyne
  4. CH3 Cl |CH Br |CHCH3 2-bromo-3-chlorobutane
AIPMT 2001
11

The correct acidic order of the following is [figure]

  1. I > II > III
  2. III > I > II
  3. II > III > I
  4. I > III > II
AIPMT 2001

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