Aldehydes, Ketones and Carboxylic Acids — Chemistry STD 12 Science — Question

Explain the displacement of diazonium group of benzene diazonium salt by halide or cyanide ion with equation. ###Short note on Sandmeyer reaction and Gattermann reaction.

Match the items of Column I and Column II.

	Column I		Column II
(i)	Diamond.	(a)	Short interval of time.
(ii)	Instantaneous rate.	(b)	Ordinarily rate of conversion is imperceptible.
(iii)	Average rate.	(c)	Long duration of time.

Answer the following questions:
Draw the geometrical isomers of complex[Pt(NH₃)₂Cl₂].

Give the equations of reaction of phenol with the following compounds:
(i) Benzene diazonium chloride
(ii) Acetone
(iii) Phthalic anhydride.

Explain positive deviation from Raoult's law with an example.

Two elements A and B form compounds having formula AB₂ and AB₄. When dissolved in 20 g of benzene (C₆H₆), 1 g of AB₂ lowers the freezing point by 2.3 K whereas 1.0 g of AB₄ lowers it by 1.3 K. The molar depression constant for benzene is 5.1 K kg mol^–1. Calculate atomic masses of A and B.

100 mg of a protein is dissolved in just enough water to make 10.0 mL of solution. If this solution has an osmotic pressure of 13.3 mm Hg at 25°C, what is the molar mass of the protein? (R = 0.0821 L atm mol^–1 K^–1 and 760 mm Hg = 1 atm.)

Give reasons:

1. Acetylation of aniline reduces its activation effect.
2. CH₃NH₂ is more basic than C₆H₅NH₂.
3. Although –NH₂ is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline.