Alcohol Phenol and Ether Quiz-3
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Q1. Phenyl magnesium bromide reacts with methanol to give a mixture of:
Solution
Q2.An organic compound ‘X ’ with molecular formula,
is insoluble in aqueous
but dissolves in NaOH. When treated with bromine water ‘X ’ rapidly gives ‘Y ’
. The compounds ‘X ’ and ‘Y ’ respectively, are
is insoluble in aqueous
but dissolves in NaOH. When treated with bromine water ‘X ’ rapidly gives ‘Y ’
. The compounds ‘X ’ and ‘Y ’ respectively, are
Solution
Compound ‘X ’ () is insoluble in aqueousbut soluble in NaOH, so it is a phenol.Since, the number of carbon atoms remains the same after bromination, the compound must be meta cresol and reactions takes place as follows
Compound ‘X ’ (
) is insoluble in aqueousbut soluble in NaOH, so it is a phenol.Since, the number of carbon atoms remains the same after bromination, the compound must be meta cresol and reactions takes place as follows
Q3. The explosive nitroglycerine is:
Solution
It is better to call nitroglycerine as glycerol trinitrate an inorganic ester of
and glycerol.
It is better to call nitroglycerine as glycerol trinitrate an inorganic ester of
and glycerol.Q4. Which one of the following gases is liberated when ethyl alcohol is heated with methyl magnesium iodide?
Solution
Ethyl alcohol reacts with methyl magnesium iodide as follows
Ethyl alcohol reacts with methyl magnesium iodide as follows
Q5.Oxidation of allyl alcohol, (
) gives a mixture of oxalic acid and formic acid.
) gives a mixture of oxalic acid and formic acid. If this oxidation is done in presence of bromine. One would expect only:
Solution
Only CHOH group is oxidized to —COOH; Double bond is not affected.
Only CHOH group is oxidized to —COOH; Double bond is not affected.
Q6. A simple method to remove peroxides from ethes is to treat them with an aqueous solution of
- KI
- KCNS
-
-
Solution
Ether peroxide oxidises KI into
and itself gets reduced to ether. Therefore, KI is added to remove peroxides from ethers.
Ether peroxide oxidises KI into
and itself gets reduced to ether. Therefore, KI is added to remove peroxides from ethers. 
Q7.An organic compound A containing C, H and O has a pleasant odour with boiling point of 78℃.
On boiling A with concentrated
, a colourless gas is produced which decolourises bromine
, a colourless gas is produced which decolourises bromine water and alkaline
. The organic liquid A is
. The organic liquid A is 
Solution
The organic liquid A is
Ethyl alcohol is a colourless liquid with a characteristic pleasant smell, having boiling point 78.1℃.
The organic liquid A is
Ethyl alcohol is a colourless liquid with a characteristic pleasant smell, having boiling point 78.1℃.
(which decolouriseswater and alk.)
water and alk.)
Q8.For which pair iodoform test cannot be used as distinction test?
Solution
The molecule should contain
The molecule should contain
Unit attached to C or H in it to shown iodoform reaction.
Q9. 
A and B are
Solution
Q10. 
-
-
-
- None of these
Solution
