Detection of the following Functional Groups: Hydroxyl, Carbonyl Carboxyl, and Amino Groups in Organic Compounds NEET Questions

Organic Chemistry - Principles of Practical Chemistry

Detection of the following Functional Groups: Hydroxyl, Carbonyl Carboxyl, and Amino Groups in Organic Compounds MCQ Questions


7.
With Lucas reagent, a tertiary alcohol gives:
A.
No turbidity at room temperature
B.
Turbidity after 5–10 min
C.
Immediate turbidity / oily layer
D.
A blue colour
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ANSWER :
C. Immediate turbidity / oily layer
8.
With Lucas reagent, a primary alcohol such as ethanol gives:
A.
Immediate turbidity
B.
No turbidity at room temperature
C.
Effervescence of H2
D.
Turbidity within 5 minutes
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ANSWER :
B. No turbidity at room temperature
9.
The iodoform test is given by:
A.
All primary alcohols
B.
All secondary alcohols
C.
Alcohols with the structure CH3–CH(OH)–R
D.
Only tertiary alcohols
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ANSWER :
C. Alcohols with the structure CH3–CH(OH)–R
10.
Which of the following alcohols does NOT give the iodoform test?
A.
Isopropanol (propan-2-ol)
B.
Methanol
C.
Butan-2-ol
D.
Ethanol
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ANSWER :
B. Methanol
11.
In the iodoform test, the yellow precipitate formed is:
A.
CHI3 (triiodomethane)
B.
CH2I2
C.
I2 (free iodine)
D.
CI4
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ANSWER :
A. CHI3 (triiodomethane)
12.
Reagent used in the iodoform test is:
A.
HI + NaOH
B.
I2 + KOH at 0–5°C only
C.
KI + NaOH
D.
I2 + NaOH (or NaOI)
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ANSWER :
D. I2 + NaOH (or NaOI)