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Which factor imparts crystalline nature to a polymer like nylon?
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Match the polymers given in Column I with their main applications given in Column II.
| Column I | Column II |
| (i) Bakelite | (a) Unbreakable crockery |
| (ii) Low-density polythene | (b) Non-stick cookwares |
| (iii) Melamine-formaldehyderesin | (c) Packaging material for shock absorbance |
| (iv) Nylon 6 | (d) Electrical switches |
| (v) Polytetrafluoroethane | (e) Squeeze bottles |
| (vi) Polystyrene | (f) Tyre, cords |
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Assertion: Polyamides are best used as fibres because of high tensile strength.
Reason: Strong intermolecular forces (like hydrogen bonding within polyamides) lead to close packing of chains and increase the crystalline character, hence, provide high tensile strength to polymers
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In which of the following structures coordination number for cations and anions in the packed structure will be same?
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Which one of the following compounds is more reactive towards SN1 reaction?
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Give reason for the following:
The product formed during SN1 reaction is a racemic mixture.
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Arrange the following in the increasing order of their property indicated:
4-Nitrobenzoic acid, benzoic acid, 3,4-Dinitrobenzoic acid, 4-Methoxy benzoic acid (Acid strength)
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In which reaction mechanism carbocation is formed?
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Racemisation occurs in ______.
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The vapour pressure of pure liquid X and pure liquid Y at 25°C are 120 mm Hg and 160 mm Hg respectively. If equal moles of X and Y are mixed to form an ideal solution, calculate the vapour pressure of the solution.
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Give reasons:
In the experimental determination of electrolytic conductance, Direct Current (DC) is not used.
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Assertion (A) : Nucleophilic substitution of iodoethane is easier than chloroethane.
Reason (R) : Bond enthalpy of C-I bond is less than that of C-Cl bond.
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Arrange the following compounds in increasing order of reactivity towards SN2 reaction.
2-Bromopentane, 1-Bromopentane, 2-Bromo-2-methylbutane
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Draw the geometrical isomers of [Co(en)2Cl2]2+. Which geometrical isomer of [Co(en)2Cl2]2+ is not optically active and why?
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Retention of configuration is observed in ______.
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An azeotropic mixture of two liquids will have a boiling point lower than either of the two liquids when it ______.
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Inversion of configuration occurs in ______.
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Which of the following relations is incorrect?
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Which of the following molecules has a chiral centre correctly labelled with an asterisk (*)?
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Which one of the following has the lowest pKa value?
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