Question
Explain Hoffmann bromamide degradation reaction with mechanism.

Answer

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  1. Complete the following chemical reaction equations:
  1. $P_4 + SO_2Cl_2\rightarrow $
  2. $XeF_4 + H_2O \rightarrow $
  1. Explain the following observations giving appropriate reasons:
  1. The stability of $+5$ oxidation state decreases down the group in group $15$ of the periodic table.
  2. Solid phosphorus pentachloride behaves as an ionic compound.
  3. Halogens are strong oxidising agents.
Explain the following :
(i) Fermentation
(ii) Dehydration
(iii) Hydrogen bonding in alcohols.
Give the oxidation state, d-orbital occupation and coordination number of the central metal ion in the following complexes:
$i. K_3\left[ Co \left( C _2 O _4\right)_3\right]$
$ii.$ cis- $\left[ Cr (e n)_2 Cl _2\right] Cl$
$iii. \left( NH _4\right)_2\left[ CoF _4\right]$
$iv. \left[ Mn \left( H _2 O \right)_6\right] SO _4$
At 291 K , the molar conductivities at infinite dilution of $\mathrm{NH}_4 \mathrm{Cl}, \mathrm{NaOH}$ and NaCl are $129.8,217.4$ and $108.9 \mathrm{S~cm}^2 \mathrm{~mol}^{-1}$ respectively. If the molar conductivity of a centinormal solution of $\mathrm{NH}_4 \mathrm{OH}$ is $9.33 \mathrm{S~cm}^2 \mathrm{~mol}^{-1}$, what is the percentage dissociation of $\mathrm{NH}_4 \mathrm{OH}$ at this dilution? Also calculate the dissociation constant of $\mathrm{NH}_4 \mathrm{OH}$.
Attempt any five of the following:
(a) Why are polysaccharides considered non-sugars?
(b) What is meant by invert sugars?
(c) Write the name of the component of starch which is water-soluble.
(d) Write the products obtained after hydrolysis of DNA.
(e) Name the deficiency disease resulting from lack of vitamin A and E in the diet.
(f) Which vitamin is linked with anti-sterility?
(g) a. What is the difference between a nucleoside and nucleotide?
     b. What products would be formed when a nucleotide from DNA containing thymine is hydrolysed?
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List various types of isomerism possible for coordination compounds, giving an example of each.
Answer the following question:
$g$ of benzoic acid $(C_6H_5COOH)$ dissolved in $25g$ of benzene shows a depression in freezing point equal to $1.62K.$ Molal depression constant for benzene is $4.9K\ kg\ mol^{-1}$. What is the percentage association of acid if it forms dimer in solution?
$(a)$ Give plausible explanation for each of the following$:$
$i.$ Why are amines less acidic than alcohols of comparable molecular masses?
$ii.$ Why are primary amines highest boiling than tertiary amines?
$iii.$ Why are aliphatic amines stronger bases than aromatic amines?
$(b)$ Complete the following reactions$:$
$i. C _6 H _5 N_2 Cl + C _2 H _5 OH \rightarrow$
$ii. C _6 H _5 NH _2+\left( CH _3 CO \right)_2 O \rightarrow$
Match the compounds given in Column I with the hybridisation and shape given in Column II and mark the correct option.
  Column I   Column II
(A) $XeF_6$ (1) $sp^3d^3$– distorted octahedral
(B) $XeO_3$ (2) $sp^3d^2$ - square planar
(C) $XeOF_4$ (3) $sp^3$- pyramidal
(D) $XeF_4$ (4) $sp^3d^2$ - square pyramidal
  1. A (1) B (3) C (4) D (2)
  2. A (1) B (2) C (4) D (3)
  3. A (4) B (3) C (1) D (2)
  4. A (4) B (1) C (2) D (3)