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Which of the following reagents can dist...

Which of the following reagents can distinguish methanol from ethanol ?

A

`CH_(3)CO_(2)H`

B

`PCl_(5)`

C

`I_(2)` and `NaOH`

D

`Na`

Text Solution

Verified by Experts

The correct Answer is:
C
Ethyl alcohol is oxidized to an acetaldehyde and hence gives a positive iodoform test:
`CH_(3)CH_(2)OH overset(I_(2)//NaOH) rarr CH_(3)CHO overset(I_(2)//NaOH) rarr underset("yellow precipiate")(CHI_(3))`
Methyl alcohol is neither oxidized to an acetaldehyde nor to a methyl ketone and hence gives a negative iodoform test.
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Knowledge Check

  • Which of the following reagents distinguish ethylene from acetylene?

    A
    Ammoniacal cuprous chloride
    B
    `Br_(2)` water
    C
    Alkaline `KMnO_(4)` solution
    D
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  • Which of the following reagents can distinguish ethyl methyl either from isopropyl alcohol ?

    A
    `Br_(2)CCl_(4)`
    B
    `AgNO_(3)//NH_(4)^(+)OH^(-)`
    C
    `I_(2) and NaOH`
    D
    `CuCl//NH_(4)^(+)OH^(-)`

  • Which of the following reagents can be used to distinguish phenol from Anisole ?

    A
    `FeCI_(3)`
    B
    Aqueous NaOH
    C
    `Br_(2)`
    D
    `NaHCO_(3)`

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