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Chemistry MCQs Quiz For Entry Test Uni Chemist
1. Aliphatic aldehydes reacts with Fehling solution and Benedict solution forming precipitate:
White ppt
Silver mirror
Brick red (Answer)
Yellow or red ppt
2. Cannizzaro's reaction is not given by:
Formaldehyde
Trimethyl
Benzaldehyde
Acetaldehyde (Answer)
3. Aldehydes react with tollen's reagent forming:
Silver mirror (Answer)
Yellow or red ppt
White red
Brick red
4. Aldehydes & ketones react with 2, 4-DNPH forming precipitates of 2, 4-dinitro-phenyl hydrione of colour:
Silver mirror
Yellow or red ppt (Answer)
Brick red
White ppt
5. Aldehydes are oxidized to give:
Carboxylic acid (Answer)
Sec-alcohol
Primary alcohols
Ter-alcohol
6. The reaction of aldehydes which are (is) base catalysed addition:
All (Answer)
Addition of hydrogen
Addition of ammonia
Polymerization
7. Aldehydes and methyl ketones reacts with saturated solution of sodium bisulphate forming precipitate:
Brick red
Silver mirror
White ppt (Answer)
Yellow or red ppt
8. Which reaction is base catalysed?
Addition of sodium bisulphate
Addition of Grignard's reagent
Addition of HCN
All (Answer)
9. Ketones react with sodium nitroprusside alkaline giving precipitate:
Wine red or orange red (Answer)
Silver ppt
White ppt
Yellow or red ppt
10. Common names of aldehydes are given by corresponding:
Alcohol
Ester
Ketone
Carboxylic acid (Answer)
11. Carboxyl compounds have functional group:
R-CH=O
R-C-X
All (Answer)
RCOR
12. A substance having only sigma bond gives reaction:
Reduction
Neutralization
Substitution (Answer)
Addition
13. Which of the following reagent will react with both aldehyde and ketones?
Fehling's reagent
Benedict's reagent
Tollen's reagent
Grignard's reagent (Answer)
14. A substance having sigma and pi bond in it gives:
Substitution
Addition (Answer)
Reduction
Neutralization
15. A base catalysed nucleophilic addition reaction will take place with a nucleophilic reagent:
Strong (Answer)
Weak
Intermediate of aldehydes
Weaker
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