IIT-JEE-Chemistry-Paper 2 -2008-Solution

1.      Correct choice: (D)

        The correct stability order of the given species is (I)>(III)>(II)>(IV).

        Structure (I) is stabilized by resonance and hyperconjugation due to 6 α-H atoms. Structure (III) is stabilized by resonance and hyperconjugation due to 3 α-H atoms. Structure (II) is stabilized by hyperconjugation due to 5 α-H atoms. Structure (IV) is stabilized by hyperconjugation due to 2 α-H atoms.

2.      Correct choice: (A)

        Cellulose is a polymer of β(D) glucose. The product cellulose triacetate should have three acetate substituents in each of is repeat unit.

3.     Correct choice: (C)

4.     Correct choice: (C)

        CuF₂ is coloured because Cu²⁺ ion has one unpaired electron in the 3d subshell. Rest of the compounds are not coloured because Cu⁺ present in each compound has completely filled 3d subshell.

5.     Correct choice: (B)

        The hybridization of Ni in [Ni(CO)₄] is sp³ and in [Ni(CN)₄]^2- is dsp².

6.     Correct choice: (C)

        Tetraamminenickel(II)-tetrachloronickelate(II)

7.     Correct choice: (B)

        I = 10 × 10^-3 = 10^-2 amp

        Q = 0.01 × 2F = 0.02 F = 0.02 × 96500 C

        t = Q/t = (0.02*96500)/10^-2 = 19.3 × 10⁴ sec.

| Next >>