How many moles of acetic anhydride (Ac₂O) is needed to react completely with tartaric acid, ribose, and glucose respectively?

(1) 2,4, 5

(2) 2, 3, 4

(3) 4, 5, 6

(4) 4, 5, 5

Glucose on reduction with Na/Hg and water gives-

1. Sorbitol

2. Fructose

3. Saccharic acid

4. Gluconic acid

What will be product when glycine, is heated–

(1)
(2)
(3)
(4)

             O
             ll
NH₂-CH-C-NH-CH₂-CO₂H
         l
       CH₃

_{Identify the amino acid obtained by hydrolysis of the above compound :-}

_{1. Glycine}

_{2. Alanine}

_{3. Both (1) and (2)}

_{4. None of the above}

At iso-electric point:

(1) conc. of cation is equal to conc of anion

(2) Net charge is zero.

(3) Maximum conc. of di-polar ion (Zwitterion) will be present

(4) All of the above

Which of the following amino acid has the lowest iso-electric point?

1. Glycine

2. Alanine

3. Aspartic acid

4. Lysine

Find iso-electric point of given amino acid

        $C{H}_3—CH—C{O}_{2}H$
$<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>|$
$<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>\underset{\oplus }{N}{H}_3$pK_a = 2.2              pK_b = 4.4

(1) 3.3

(2) 5.9

(3) 9.6

(4) 11.8

Find an iso-electric point of the given amino acid

1. 5.5

2. 6.5

3. 3

4. 5

$\mathrm{H}-\mathrm{C}\equiv \mathrm{C}-\mathrm{H}<mspace\; width="1em"></mspace>\underset{{\mathrm{H}}_2{\mathrm{SO}}_4}{\overset{{\mathrm{HgSO}}_4}{\to }}\left(A\right)<mspace\; width="1em"></mspace>\underset{\left(2\right){\mathrm{H}}_3{\mathrm{O}}^{\oplus }}{\overset{\left(1\right){\mathrm{NH}}_3+\mathrm{HCN}}{\to }}\left(B\right)$ Product (B) of given reaction is:

(1) Glycine

(2) Alanine

(3) valine

(4) Leucine

Which amino acid does not contain a chiral center?

1. Valine

2. Leucine

3. Glycine

4. Iso-leucine