Class XII

One of the following is used for the separation and purification of aldehydes
  1. hydrogen cyanide
  2. Grignard reagent
  3. None of these
  4. Sodium hydrogensulphite
Arrange the following compounds in decreasing order of their acid strength: i) trichloroacetic acid ii) trifluoroacetic acid iii) acetic acid and iv)formic acid
  1. trifluoroacetic acid, trichloroacetic acid, formic acid and acetic acid
  2. trifluoroacetic acid, trichloroacetic acid, formic acid.and acetic acid
  3. trichloroacetic acid, trifluoroacetic acid, acetic acid and formic acid.
  4. trifluoroacetic acid, formic acid acetic acid and Propan – 1 – ol, 4 – methylphenol
Which of the following acids does not exhibit optical isomerism?
  1. Lactic acid
  2. α – amino acids
  3. Tartaric acid
  4. Maleic acid
The compound obtained when acetaldehyde reacts with dilute aqueous sodium hydroxide exhibits:
  1. both optical and geometrical isomerism
  2. optical isomerism.
  3. geometrical isomerism
  4. neither optical nor geometrical isomerism
The aldehydes and ketones undergo one of the following reactions.
  1. nucleophilic addition reactions
  2. substitution reaction
  3. None of these
  4. electrophilic addition reactions
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