1
MCQ (Single Correct Answer)

AIPMT 2006

The general molecular formula, which represents the homologous series of alkanols is
A
CnH2n+2O
B
CnH2nO2
C
CnH2nO
D
CnH2n+1O

Explanation

General molecular formula of alkanols is

CnH2n+2O or CnH2n+1OH
2
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.
3
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.
4
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

EXAM MAP

Joint Entrance Examination

JEE Advanced JEE Main

Medical

NEET

Graduate Aptitude Test in Engineering

GATE CE GATE ECE GATE ME GATE IN GATE EE GATE CSE GATE PI