Important Questions Class XII Chemistry (2009) Set - III
Chemistry

Q. 1. Among the isomeric alkanes of molecular formula C₅H1₂, identify the one that on photochemical chlorination yields (i) A single monochloride (ii) Three isomeric monochlorides. (1 mark)

Q. 2. While separating a mixture of ortho and Para nitrophenols by steam distillation, name the isomer which will be steam volatile. Give reason. (1 mark)

Q. 3. With the help of an example discuss the stereo chemistry involved in S_N1 and S_N 2 mechanism. (2 marks)

Q. 4. Explain Saytzeff rule  by taking suitable examples. (2 marks)

Q. 5. Draw the structures of all isomeric alcohols of molecular formula C₅H1₂O and give their IUPAC names. Classify these isomers of alcohols as primary, secondary and tertiary alcohols. (2 marks)

Q. 6. Nitro group increases the reactivity of chlorobenzene when attached to o and p- position but not at meta position? Explain? Write the mechanism also. (3 marks)

Q. 7. Give equations of the following reactions: (3 mark)

1. Preparation of Sec-Butyl alcohol from ethanal
2. Preparation of Phenol from Aniline.
3. Treating phenol with chloroform in presence of aqueous NaOH.

Q. 8. How will you distinguish between the following: (3 marks)

1. Propanoic acid and propanal
2. Ethanal and Benzaldehyde
3. Pentan-3-one and Pentan-2-one

Q. 9. How will you bring about the following conversions in not more than two steps. (5 marks)

1. Propanone to Propene
2. Benzene to m-Nitroacetophenone
3. Chlorobenzene to benzoic acid
4. Propanoic acid to propene
5. Propyne to propan-2-ol

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