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An organic compound contains $69.77 \%$ carbon, $11.63 \%$ hydrogen and rest oxygen. The molecular mass of the compound is 86 . It does not reduce Tollens' reagents but forms an addition compound with sodium hydrogen sulphite and give positive iodoform test on vigorous oxidation it gives ethanoic and propanoic acid. Write the possible structure of the compound.
What is the difference between order of a reaction and its molecularity?
(a) What type of protein is present in keratin?
(b) Write the reactions showing the presence of following in the open structure of glucose:
   i. an aldehyde group
  ii. a primary alcohol
(c) What products would be formed when a nucleotide from DNA containing thymine is hydrolysed?
(d) Amino acids show amphoteric behaviour. Why?
(e) What are a Amino Acids? Give examples.
(f) a. How can you explain the absence of an aldehyde group in the pentaacetate of D-glucose?
    b. Name the bases present in RNA. Which one of these is not present in DNA?
(g) Which monosaccharide units are present in starch, cellulose and glycogen and which linkages link these units?
Define the following modes of expressing the concentration of a solution. Which of these modes are independent of temperature and why?
  1. w/w (mass percentage)
  2. V/V (volume percentage)
  3. w/V (mass by volume percentage)
  4. ppm. (parts per million)
  5. x (mole fraction)
  6. M (Molarity)
  7. m (Molality)
(a) What is van't Hoff factor? Explain.
(b) Write the equation of molecular number properties including van't Hoff factor.
(i) Define the order of a reaction.
(ii) Explain the effect of concentration of reactant on the rate constant.
(iii) For a first order reaction, if the rate constant at 500 K and 600 K are $0.03 s^{-1}$ and $0.06 s^{-1}$ respectively, then calculate the activation energy.
$
\left[R=8.314 JK^{-1} mol^{-1}, \log 2=0.3010\right]
$
Give the electronic configuration of the following complexes on the basis of Crystal Field Splitting theory.
[CoF6]3-, [Fe(CN)6]4- and [Cu(NH3)6]2+
Calculate the standard cell potentials of galvanic cell in which the following reactions take place :
(i) $2 Cr ( s )+3 Cd ^{2+}( aq ) \rightarrow 2 Cr ^{3+}( aq )+3 Cd ( s )$
(ii) $Fe ^{2+}$ (aq) $+ Ag ^{+}$(aq) $\rightarrow Fe ^{3+}$ (aq) + Ag (s)
Calculate the $\Delta_r G^{\circ}$ and equilibrium constant of the reactions.
Explain the open chain structure of glucose.
Cyclobutyl bromide on treatment with magnesium in dry ether forms an organometallic A. The organometallic reacts with ethanol to give an alcohol B after mild acidification. Prolonged treatment of alcohol B with an equivalent of HBr gives 1-bromo-1-methyl cyclopentane $C$. Write the structures of $A, B$ and explain how the $C$ is obtained from B?