1
MCQ (Single Correct Answer)

AIPMT 2011 Mains

Which of the following is not a fat soluble vitamin?
A
Vitamin B complex
B
Vitamin D
C
Vitamin E
D
Vitamin A

Explanation

Vitamin B complex is not a fat soluble vitamin. It is a water soluble vitamin.
2
MCQ (Single Correct Answer)

AIPMT 2011 Prelims

Which one of the following statements is not true regarding (+) lactose?
A
On hydrolysis (+) lactose gives equal amount of D(+) glucose and D(+) galactose.
B
(+) Lactose is a $$\beta $$-glucoside formed by the union of a molecule of D(+) glucose and a molecule of D(+) galactose.
C
(+) Lactose is a reducing sugar and does not exihibit mutarotation.
D
(+) Lactose, C12H22O11 contains 8-OH groups

Explanation

(+) Lactose is a reducing sugar and all reducing sugar shows mutarotation.
3
MCQ (Single Correct Answer)

AIPMT 2010 Mains

Fructose reduces Tollen's reagent due to
A
asymmetric carbons
B
primary alcoholic group
C
secondary alcoholic group
D
enolisation of fructose followed by conversion to aldehyde by base

Explanation

Under alkaline conditions of the reagent, fructose gets converted into a mixture of glucose and mannose (Lobry de Bruyn van Ekenstein rearrangement) both of which contain the –CHO group and hence reduce Tollens’ reagent to give silver mirror test.
4
MCQ (Single Correct Answer)

AIPMT 2010 Prelims

Which one of the following does not exhibit the phenomenon of mutaroation?
A
(+) Sucrose
B
(+) Lactose
C
(+) Maltose
D
($$-$$) Fructose

Explanation

Sucrose does not show mutarotation.

Only those sugars which have a free aldehyde or ketone group are capable of showing mutarotation.

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