21.

The maximum possible denticities of a ligand given below towards a common transition and inner-transition metal ion, respectively, are :

• 8 and 8

• 6 and 8

• 8 and 6

• 6 and 6

Noradrenaline is a/an :

• Antacid

• Antihistamine

• Antidepressant

• Neurotransmitter

Which of the following compounds is a constituent of the polymer?

[-HN-CO-NH-CH₂-]_n

• Ammonia

• Methylamine

• Formaldehyde

• N-methyl urea

Increasing order of reactivity of the following compounds for S_N1 substitution is:

• (B) < (C) < (D) < (A)

• (A) < (B) < (D) < (C)

• (B) < (C) < (A) < (D)

• (B) < (A) < (D) < (C)

p-Hydroxybenzophenone upon reaction with bromine in carbon tetrachloride gives:

Which of the following potential energy (PE) diagrams represents the S_N1 reaction?

In the following reaction carbonyl compound +MeOH $\stackrel{\mathrm{HCl}}{\rightleftarrows }$ acetal.

Rate of the reaction is highest for:

• Acetone as substrate and methanol in excess

• Propanal as substrate and methanol in stoichiometric amount.

• Propanal as substate and methanol in excess.

• Acetone as substrate and methanol in stoichiometric amount.

The major product of the following reaction is:

The peptide that gives positive ceric ammonium nitrate and carbylamines tests is:

• Asp-Gln

• Ser-Lys

• Gln-Asp

• Lys-Asp

The major products A and B for the following reactions are, respectively: