Alcohol Phenol and Ether Quiz-10
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Q1. Consider the following reaction,
Among the following, which one cannot be formed as a product
under any conditions?
Solution
(a), (b), (d) may be formed but (c) is never formed Hence, correct choice→(c).
Q2.
Solution
Q3. 1-propanol and 2-propanol can be distinguished by
- Oxidation with alkaline
followed by reaction with Fehling solution - Oxidation with acidic dichromate followed by reaction with Fehling solution
- Oxidation by heating with copper followed by reaction with Fehling solution
- Oxidation with concentrated
followed by reaction with Fehling solution
Solution
Catalytic dehydrogenation involves the passing of vapours of alcohol over reduced copper at 300℃ and the product thus formed is identified. Primary alcohols gives aldehyde while secondary alcohols give ketones
Catalytic dehydrogenation involves the passing of vapours of alcohol over reduced copper at 300℃ and the product thus formed is identified. Primary alcohols gives aldehyde while secondary alcohols give ketones
Q4. Which could not be obtained from wood?
-
-
- Wood tar
- Wood charcoal
Solution
Pyroligneous acid obtained during destructive distillation of wood contains mainly acetic acid (9-10 %), methyl alcohol (2-2.5%) and acetone about 0.5%; the other distillation products are wood gas, wood charcoal, wood tar.
Pyroligneous acid obtained during destructive distillation of wood contains mainly acetic acid (9-10 %), methyl alcohol (2-2.5%) and acetone about 0.5%; the other distillation products are wood gas, wood charcoal, wood tar.
Q5.
gives white precipitate within 5 min with concentrated hydrochloric acid in the presence of
gives white precipitate within 5 min with concentrated hydrochloric acid in the presence of anhydrous zinc chloride. Alcohol can be
Solution
Secondary alcohols give turbidity within 5 min with Lucas reagent.
Secondary alcohols give turbidity within 5 min with Lucas reagent.
Q6. When o-or p-phenol sulphonic acid is treated with bromine water, the product formed is
Solution
Like nitration, bromination of o-or p-phenolsulphonic acid occurs with simultaneous replacement of
group by Br atom to ultimately give 2, 4, 6-tribromophenol.
Like nitration, bromination of o-or p-phenolsulphonic acid occurs with simultaneous replacement of
group by Br atom to ultimately give 2, 4, 6-tribromophenol. 
Q7.Ketone upon treatment with Grignard reagent gives
Solution
Ketones give an addition product having more number of carbon atoms with Grignard reagent, which on hydrolysis gives an alcohol (3°). Formaldehyde gives primary alcohol with Grignard reagent while any other aldehyde except formaldehyde give secondary alcohol.
Ketones give an addition product having more number of carbon atoms with Grignard reagent, which on hydrolysis gives an alcohol (3°). Formaldehyde gives primary alcohol with Grignard reagent while any other aldehyde except formaldehyde give secondary alcohol.
Q8. The commonly used dehydrating agent in the preparation of an ester is:
-
- Anhydride
- Anhydride
- Conc.
Solution
acts as catalyst as well as dehydrating agent for the reaction,
acts as catalyst as well as dehydrating agent for the reaction,
Q9.Which of the following alcohols cannot be oxidized by potassium dichromate in the presence of
sulphuric acid?
Solution
Q10. When phenol is treated with excess of bromine water, it gives
Solution
2, 4, 6-tribromophenol
2, 4, 6-tribromophenol
