1
MCQ (Single Correct Answer)

AIPMT 2005

Which one of the following compounds is most acidic?
A
Cl $$-$$ CH2 $$-$$ CH2 $$-$$ OH
B
C
D

Explanation

Phenols are more acidic than alcohols as they are resonance stabilised whereas alcohols are not.

Further –NO2 is an electron withdrawing group which increases acidic character and facilitates release of proton, whereas –CH3 is an electron donating group which decreases acidic character, thus removal of H+ becomes difficult.
2
MCQ (Single Correct Answer)

AIPMT 2004

Which one of the following will not form a yellow precipitate on heating with an alkaline solution of iodine?
A
CH3CH(OH)CH3
B
CH3CH2CH(OH)CH3
C
CH3OH
D
CH3CH2OH

Explanation

Formation of a yellow precipitate on heating a compound with an alkaline solution of iodine is known as iodoform reaction. Methyl alcohol does not respond to this test. Iodoform test is exhibited by ethyl alcohol, acetaldehyde, acetone, methyl ketones and those alcohols which possess CH3CH(OH) – group.
3
MCQ (Single Correct Answer)

AIPMT 2002

When phenol is treated with CHCl3 and NaOH, the product formed is
A
benzaldehyde
B
salicylaldehyde
C
salicylic acid
D
benzoic acid.

Explanation

4
MCQ (Single Correct Answer)

AIPMT 2002

n-propyl alcohol and isopropyl alcohol can be chemically distinguished by which reagent
A
PCl5
B
reduction
C
oxidation with potassium dichromate
D
ozonolysis.

Explanation

n-propyl alcohol on oxidation with K2Cr2O7 gives an aldehyde which on further oxidation gives an acid.



Isopropyl alcohol on oxidation gives a ketone with the same number of carbon atoms as original alcohol.

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