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Assertion: All naturally occurring α-aminoacids except glycine are optically active.
Reason: Most naturally occurring amino acids have L-configuration.
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A natural linear polymer of 2-methyl-1, 3-butadiene becomes hard on treatment with sulphur between 373 to 415 K and – S – S – bonds are formed between chains. Write the structure of the product of this treatment?
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Identify the type of polymer given in the following figure.
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To have practical applications why are cross links required in rubber?
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Why does cis-polyisoprene possess elastic property?
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What is the structural difference between HDP and LDP? How does the structure account for different behaviour and nature, hence the use of a polymer?
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Assertion: Network polymers are thermosetting.
Reason: Network polymers have high molecular mass.
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Which is the correct statement about birth control pills?
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The most useful classification of drugs for medicinal chemists is ______.
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Which of the following statements are incorrect about receptor proteins?
(i) Majority of receptor proteins are embedded in the cell membranes.
(ii) The active site of receptor proteins opens on the inside region of the cell.
(iii) Chemical messengers are received at the binding sites of receptor proteins.
(iv) Shape of receptor doesn’t change during attachment of messenger.
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Where are receptors located?
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How are receptor proteins located in the cell membrane?
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Match the class of compounds given in Column I with their functions given in Column II.
| Column I | Column II |
| (i) Antagonists | (a) Communicate message between two neurons and that between neurons to muscles |
| (ii) Agonists | (b) Bind to the receptor site and inhibit its natural function |
| (iii) Chemical messenger | (c) Crucial to body’s communication process |
| (iv) Inhibitors | (d) Mimic the natural messenger |
| (v) Receptors | (e) Inhibit activities of enzymes |
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Assertion: Receptors are crucial to body’s communication process.
Reason: Receptors are proteins.
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Assertion: Chemical messengers are chemicals that enable communication of message between two neurons or between neurons and muscles.
Reason: Chemicals enter the cell through receptor.
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Assertion: Chemical messenger gives message to the cell without entering the cell.
Reason: Chemical messenger is received at the binding site of receptor proteins.
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Assertion: Receptor proteins show selectivity for one chemical messenger over the other.
Reason: Chemical messenger binds to the receptor site and inhibits its natural function.
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What happens when reactions:
Benzylchloride is treated with ammonia followed by the reaction with Chloromethane.
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Represent the cell in which the following reaction takes place.The value of E˚ for the cell is 1.260 V. What is the value of Ecell?
\[\ce{2Al (s) + 3Cd^{2+} (0.1M) -> 3Cd (s) + 2Al^{3+} (0.01M)}\]
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Classify the following amine as primary, secondary or tertiary:
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