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Isomerism

NEET 2013 (Karnataka)MCQMedium📈 Topic in 25% papers+4−1
Ques. 1NEET 2013 (Karnataka)

Number of isomeric alcohols of molecular formula C6H14O which give positive iodoform test is

  1. three
  2. four
  3. five
  4. two

Answer

(2) four

Solution

Iodoform test is given by alcohols having the CH3-CH(OH)-R unit.

For C6H14O ⇒ R = C4H9, which has four isomeric forms:

(i) CH3CH(OH)CH2CH2CH2CH3 (hexan-2-ol)

(ii) CH3CH(OH)CH2CH(CH3)2 (4-methylpentan-2-ol)

(iii) CH3CH(OH)CH(CH3)CH2CH3 (3-methylpentan-2-ol)

(iv) CH3CH(OH)C(CH3)3 (3,3-dimethylbutan-2-ol)

∴ Number of such alcohols = 4

Answer: (2)

Keep practising — Isomerism

Ques. 2AIPMT 2012 (Prelims)

Which of the following acids does not exhibit optical isomerism?

  1. Maleic acid
  2. -amino acids
  3. Lactic acid
  4. Tartaric acid
Ques. 3AIPMT 2011 (Mains)

The IUPAC name of the following compound is [figure]

  1. trans-2-chloro-3-iodo-2-pentene
  2. cis-3-iodo-4-chloro-3-pentene
  3. trans-3-iodo-4-chloro-3-pentene
  4. cis-2-chloro-3-iodo-2-pentene
Ques. 4AIPMT 2010 (Mains)

Which of the following conformers for ethylene glycol is most stable?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 5AIPMT 2010 (Prelims)

In the following the most stable conformation of n-butane is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 6AIPMT 2009

Which of the following compounds will exhibit cis-trans (geometrical) isomerism?

  1. Butanol
  2. 2-Butyne
  3. 2-Butanol
  4. 2-Butene
Ques. 7AIPMT 2008

How many stereoisomers does this molecule have? CH3CH=CHCH2CHBrCH3

  1. 8
  2. 2
  3. 4
  4. 6
Ques. 8AIPMT 2007

CH3-CHCl-CH2-CH3 has a chiral centre. Which one of the following represents its R-configuration?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 9AIPMT 2007

If there is no rotation of plane polarised light by a compound in a specific solvent, though thought to be chiral, it may mean that

  1. the compound is certainly meso
  2. there is no compound in the solvent
  3. the compound may be a racemic mixture
  4. the compound is certainly achiral.
Ques. 10AIPMT 2006

Which of the following is not chiral?

  1. 2-Hydroxypropanoic acid
  2. 2-Butanol
  3. 2,3-Dibromopentane
  4. 3-Bromopentane
Ques. 11AIPMT 2005

The chirality of the compound [figure]

  1. R
  2. S
  3. E
  4. Z

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