12 Questions
What reagent is used to detect 1ᴼ, 2ᴼ, and 3ᴼ alcohols in the Lucas Test?
Concentrated HCl
Which compound forms a white ppt of AgCl in the Lucas Test?
Primary alcohol
Which functional group reacts with [Ag(NH3)2]⁺ to form a silver mirror in Tollen's Reagent test?
Aldehyde
Which compound reacts with NaHCO3 to produce CO2 gas?
Carboxylic acid
What is the product formed in the Iodoform Test involving an aldehyde or ketone with at least one CH3 group?
CHI3 (yellow ppt)
What type of bonds must be present in a compound to undergo Bayer's Test and decolorize?
Double bonds
Aldehydes react with [Ag(NH3)2]+ to form a silver mirror in Tollen's Reagent test.
True
Ketones react with [Ag(NH3)2]+ to form a silver mirror in Tollen's Reagent test.
False
In the Lucas Test, 1ᴼ alcohols show immediate turbidity when treated with AgNO2.
False
The Iodoform Test is used to detect aldehydes and ketones that have at least one CH3 group.
True
NaHCO3 reacts with carboxylic acids to produce CO2 gas.
True
Bayer's Test is used to detect aliphatic and aromatic primary amines.
True
Study Notes
Distinction Tests
- Lucas Test: distinguishes between 1ᴼ, 2ᴼ, and 3ᴼ alcohols using Conc. HCl and anhydrous AlCl₃
- AgNO₂ Test: distinguishes between haloalkanes and haloarenes
- Tollen's Reagent: detects aldehydes and ketones in alkaline medium, forming a silver mirror (Ag)
- Fehling's Test: detects aldehydes and ketones (including aromatic aldehydes), forming a red-brown ppt (Cu₂O)
Iodoform Test
- detects aldehydes and ketones with at least one CH₃ group
- reaction: NaOH + I₂ → CHI₃ (yellow ppt)
NaHCO₃ Test
- detects RCOOH and phenol
- reaction: RCOOH + NaHCO₃ → RCOONa + CO₂↑
2,4 DNP Test
- detects either RCHO or ketone
Bayer's Test
- detects double or triple bonds in straight-chain compounds
- reaction: Br₂ / H₂O → decolorization
Azo-Dye Test
- detects 1ᴼ amines in aliphatic and aromatic compounds
- reaction: HNO₂ + β-naphthol → orange dye (insoluble in water)
This quiz covers the distinction between Reagent Lucas test for 1°, 2°, 3° alcohols, AgNO2 test for Haloalkane & Haloarene, and Tollen's reagent test for Aldehyde & Ketone. It also includes reaction observations, detection methods, and remarks for different chemical compounds.
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