1
MCQ (Single Correct Answer)

JEE Main 2017 (Online) 8th April Morning Slot

Among the following, the essential amino acid is :
A
Alanine
B
Valine
C
Aspartic acid
D
Serine
2
MCQ (Single Correct Answer)

JEE Main 2017 (Online) 9th April Morning Slot

The incorrect statement among the following is :
A
$$\alpha $$-D-glucose and $$\beta $$-D-glucose are anomers.
B
$$\alpha $$-D-glucose and $$\beta $$-D-glucose are enantiomers.
C
Cellulose is a straight chain polysaccharide made up of only $$\beta $$-D-glucose units.
D
The penta acetate of glucose does not react with hydroxyl amine

Explanation

$$\alpha $$-D-glucose and $$\beta $$-D-glucose are anomers not enantiomers.
3
MCQ (Single Correct Answer)

JEE Main 2018 (Offline)

Glucose on prolonged heating with HI gives
A
6-iodohexanal
B
n-Hexane
C
1-Hexene
D
Hexanoic acid

Explanation

As HI is a strong reducing agent, it reduces all the aldehydes and ketones to acohol and alcohols are further reduce to alkanes.

4
MCQ (Single Correct Answer)

JEE Main 2018 (Offline)

The predominant form of histamine present in human blood is (pKa, Histidine = 6.0)
A
B
C
D

Explanation

Blood is slightly basic in nature as it's pH is around 7.4 .



In Histamine there is two basic centers

(1) $$\,\,\,$$ Aliphatie amino group

(2) $$\,\,\,$$ Basic nitrogen of imidazole ring.

Where pKa of Aliphatic amino group is 9.4 and pKa of basic nitrogen of imidazole ring is 5.8.

As more pKa value means more basic, So, aliphatic amino group is more basic.

As pH of blood is 7.4 so pKa of blood is < 7.4. So, $$-$$NH2 group will act as more basic compare to blood. So, blood will act as acid and donate H+ to $$-$$NH2 group.

So, Histamine in blood will become this :

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