COMPASSLearning
RegisterLogin

CBSE Class 12 · 2020 · Alcohols Phenols and EthersMultiple Choice

WhatsApp Email
The iodoform test is not given by:
  1. (A)Ethanol
  2. (B)Ethanal
  3. (C)Pentan-2-one
  4. (D)Pentan-3-one✓ Correct

Answer: (D)

Solution

Iodoform needs the CH–CO– (or CH–CH(OH)–) unit.
Ethanol → oxidised in situ to CHCHO ✓; ethanal ✓; pentan-2-one (CHCO–CH) ✓.
Pentan-3-one, CH–CO–CH, has no methyl ketone group → no iodoform.
Correct option: (D).

CBSE Class 12 Board · 2020 · Single correct option

Practise more: all CBSE board PYQs on Alcohols Phenols and Ethers →

More board questions on Alcohols Phenols and Ethers

  1. Out of the following alkenes, the one which will produce tertiary butyl alcohol on acid-catalysed hydration is:
    CBSE 2024View solution →
  2. Assertion (A): p-Methoxyphenol is a stronger acid than p-nitrophenol.
    Reason (R): The methoxy group shows a +I effect whereas the nitro group shows a −I effect.
    CBSE 2024View solution →
  3. Give the structure of the major product expected from each of the following reactions:
    (a) reaction of ethanal with methyl magnesium bromide followed by hydrolysis
    (b) hydration of but-1-ene in the presence of dilute sulphuric acid
    (c) reaction of phenol with bromine water
    CBSE 2024View solution →
  4. Which of the following alcohols will not undergo oxidation?
    CBSE 2023View solution →
  5. The substitution reaction of an alkyl halide mainly occurs by the SN1 or SN2 mechanism. Whatever mechanism alkyl halides follow for the substitution reaction to occur, the polarity of the carbon-halogen bond is responsible for these substitution reactions. The rate of SN1 reactio …
    CBSE 2020View solution →
  6. (a) Out of t-butyl alcohol and n-butanol, which one undergoes acid-catalysed dehydration faster, and why? (2)
    (b) Carry out the following conversions: (1×3)
    (i) phenol to salicylaldehyde
    (ii) t-butyl chloride to t-butyl ethyl ether
    (iii) propene to propanol
    CBSE 2020View solution →