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Write a detailed note on enzymes.
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Attempt any five of the following:
(a) What is the structural feature characterising reducing sugars?
(b) What type of linkage is present in polysaccharides?
(c) Give examples of fat soluble vitamins.
(d) The two strands in DNA are not identical but are complementary. Explain.
(e) Write uses of B-Complex.
(f) Name the disaccharide which on hydrolysis gives two molecules of glucose.
(g) Name purines present in DNA?
(a) What is the structural feature characterising reducing sugars?
(b) What type of linkage is present in polysaccharides?
(c) Give examples of fat soluble vitamins.
(d) The two strands in DNA are not identical but are complementary. Explain.
(e) Write uses of B-Complex.
(f) Name the disaccharide which on hydrolysis gives two molecules of glucose.
(g) Name purines present in DNA?
Consider the reaction $\text{R}\xrightarrow{\ \ \text{k}\ \ } \text{P}.$ The change in concentration of $R$ with time is shown in the following plot:
→- Predict the order of the reaction.
- Derive the expression for the time required for the completion of the reaction.
- What does the slope of the above line indicate?
Explain the IUPAC method of nomenclature coordination compounds with examples.
Explain the properties and uses of methanol and ethanol.
Match the laws given in Column I with expresions given in Column II.
→| Column I | Column II | ||
| i. | Raoult’s law | a. | $\Delta\text{T}_\text{f}=\text{K}_\text{f}\text{m}$ |
| ii. | Henry’s law | b. | $\pi=\text{CRT}$ |
| iii. | Elevation of boiling point | c. | $\text{p}=\text{x}_1\text{p}^0_1+\text{x}_2\text{p}^0_2$ |
| iv. | Depression in freezing point | d. | $\Delta\text{T}_\text{b}=\text{K}_\text{b}\text{m}$ |
| v. | Osmotic pressure | e. | $\text{p}=\text{K}_\text{H}\cdot\text{x}$ |
Explain the general methods of preparation of amines.
All energetically effective collisions do not result in a chemical change. Explain with the help of an example.
$(a).$ Out of formic acid and acetic acid, which one will give the $HVZ$ reaction? Give a suitable reason in support of your answer and write the chemical reaction involved.
$(b).$ Alcohols are acidic but they are weaker acids than water. Arrange various isomers of butanol in the increasing order of their acidic nature. Give a reason for the same.
$(c).$ An organic compound $A$ which is a Grignard reagent is used to obtain $2-$methylbutan$-2-ol$ on reaction with a carbonyl compound $'B \ '.$ Identify $'A \ '$ and $'B \ '.$ Write the equation for the reaction between $A$ and $B.$
→$(b).$ Alcohols are acidic but they are weaker acids than water. Arrange various isomers of butanol in the increasing order of their acidic nature. Give a reason for the same.
$(c).$ An organic compound $A$ which is a Grignard reagent is used to obtain $2-$methylbutan$-2-ol$ on reaction with a carbonyl compound $'B \ '.$ Identify $'A \ '$ and $'B \ '.$ Write the equation for the reaction between $A$ and $B.$
- Describe the favourable conditions for the manufacture of (i) ammonia by Haber’s process, and (ii) sulphuric acid by contact process.
- Draw the structures of the following:
- $PCl_5 (g)$.
- $S_8 (g)$.
- $CIF_3 (g)$.
An organic compound $A$ with molecular formula $C_7H_7NO$ reacts with $Br_2/aq.$ $KOH$ to give compound $B,$ which upon reaction with $NaNO_2$ and $HCl$ at $0^\circ C$ gives $C.$ Compound $C$ on heating with $CH_3CH_2OH$ gives a hydrocarbon $D.$ Compound $B$ on further reaction with $Br_2$ water gives white precipitate of compound $E.$ Identify the compound $A, B, C, D$ and $E;$ also justify your answer by giving relevant chemical equations.
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