Which of the following does not have a metal-carbon bond?

1. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{MgBr}$

2. $\mathrm{K}\left[\mathrm{Pt}\left({\mathrm{C}}_2{\mathrm{H}}_4\right){\mathrm{Cl}}_3\right]$

3. $\mathrm{Ni}(\mathrm{CO}{)}_4$

4. $\mathrm{Al}{\left({\mathrm{OC}}_2{\mathrm{H}}_5\right)}_3$

Which one of the following is a chain growth polymer:

1. Nucleic acid

2. Polystyrene

3. Protein

4. Starch 

The correct statement in respect of protein haemoglobin is that it:

A sequence of how many nucleotides in messenger RNA make a codon for an amino acid:

1. Four

2. One

3. Two

4. Three

Which hormone facilitates the conversion of glucose to glycogen?

1. Bile acids

2. Adrenaline

3. Insulin

4. Cortisone 

Anticancer agent among the following is:

1.		2.
3.		4.

If the bond energies of H–H, Br – Br, and H –Br are 433, 192, and 364 kJ mol^–1 respectively, the ∆Hº for the reaction H₂(g) + Br₂(g) → 2HBr(g) will be:

The compound responsible for the depletion of the ozone layer in the upper strata of the atmosphere is:

1. Ferrocene

2. Fullerenes

3. Freons

4. Polyhalogens

Which of the following pairs contains species that are not isostructural?

1. ${\mathrm{IO}}_3^{-}\text{and\hspace{0.17em}}{\mathrm{XeO}}_3$

2. ${\mathrm{BH}}_4^{-}\text{and\hspace{0.17em}}{\mathrm{NH}}_4^{+}$

3. ${\mathrm{PF}}_6^{-}\text{and\hspace{0.17em}}{\mathrm{SF}}_6$

4. ${\mathrm{SiF}}_4\text{\hspace{0.17em}and\hspace{0.17em}}{\mathrm{SF}}_4$

The rate of a first-order reaction is 1.5 ×10^–2 mol L^–1 min^–1 at 0.5 M concentration of the reactant. The half-life of the reaction is: