31.

Which of the following is not correct?

• Iodine oxidises sodium thiosulphate to sodium tetrathionate

• Sodium thiousulphate is soluble in water

• Ozone is used to identify the presence of unsaturation in alkenes

• Sodium thiosulphate reacts with iodine to form sodium sulphate

Which one of the following pairs of reactants does not form oxygen when they react with each other?

• F₂, NaOH solution (hot, conc.)

• F₂, H₂O

• Cl₂, NaOH solution (cold, dilute)

• CaOCl₂, H₂SO₄ (dilute, small amount)

Identify A and B in the following reactions

• A = C₂H₂, B = C₂H₆

• A = C₂H₅Cl, B = C₂H₄

• A = C₂H₄, B = C₂H₅Cl

• A = C₂H₅Cl, B = C₂H₅Cl

In which ofthe following reactions the product is an ether?

• C₆H₆ + CH₃COCl / anhydrous AlCl₃

• C₂H₅Cl + aq.KOH 

• C₆H₆ + C₆H₅COCl/ anhydrous AlCl₃

• C₂H₅Cl + C₂H₅ONa

Which of the following, compounds is 'the reactant in Rosenmund's reduction?

• CH₃CO₂H

• CH₃CHO

• CH₃CH₂Cl

• CH₃COCl

3-hydroxybutanal is formed when (X) reacts with (Y) in dilute (Z) solution. What are X,Y  and Z?

• $\underset{\left(\mathrm{X}\right)}{{\mathrm{CH}}_3\mathrm{CHO}},\underset{\left(\mathrm{Y}\right)}{ ({\mathrm{CH}}_3{)}_2\mathrm{CO}}, \underset{\left(\mathrm{Z}\right)}{\mathrm{NaOH}}$

• $\underset{\left(\mathrm{X}\right)}{{\mathrm{CH}}_3\mathrm{CHO}}, \underset{\left(\mathrm{Y}\right)}{{\mathrm{CH}}_3\mathrm{CHO},} \underset{\left(\mathrm{Z}\right)}{\mathrm{NaCl}}$

• $\underset{\left(\mathrm{X}\right)}{({\mathrm{CH}}_3{)}_2\mathrm{CO},} \underset{\left(\mathrm{Y}\right)}{({\mathrm{CH}}_3{)}_2\mathrm{CO}},\underset{\left(\mathrm{Z}\right)}{ \mathrm{HCl}}$

• ${\mathrm{CH}}_3\mathrm{CHO}, {\mathrm{CH}}_3\mathrm{CHO}, \mathrm{NaOH}$

'Natalite' is used as

• anaesthetic

• substitute for petrol

• insecticide

• preservative

In the reaction $\underset{\left(\mathrm{vapour}\right)}{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}} \underset{300°\mathrm{C}}{\overset{\mathrm{Cu}}{\to }} \mathrm{X}$. The molecular formula of X is

• C₄H₆O

• C₄H₁₀O

• C₂H₄O

• C₂H₆

Which of the following is not correct?

• Chlorophyll is responsible for the synthesis of carbohydrates in plants

• The compound formed in the addition of oxygen to haemoglobin is called oxyhaemoglobin.

• Acetyl salicylic acid is known as aspirin.

• The metal ion present in vitamin B₁₂ is Mg²⁺

Match the following lists

List I	List II
(A) Benzene	1. Phosegen
(B) Ethylene	2. Silver mirror
(C) Acetaldehyde	3. Mustard gas
(D) Chloroform	4. (4n+2)Π electron
	5.Carbylamine

The correct answer is

• A B C D

  4 3 2 1

• A B C D

  3 2 1 4

• A B C D

  2 4 5 3

• A B C D

  5 1 4 3