RAWALPINDI BOARD 2015
PART-2
Time: 20 Min.
Marks: 17
Note: You have four choice for each objective type question as A, B, C and D. The choice which you think is correct; fill that circle in front of that question number. Use marker or pen to fill the circles. Cutting or filling two or more circles will result in zero mark in that question.

• Which one is a disaccharide?

1. Sucrose

• Ammonium nitrate fertilizer is not used for which crop.

1. Paddy rice

• Which are carcinogenic class of compounds?

1. Dioxins

• Which one is an incomplete period?

1. (A) 7^th

• The Oxides of Beryllium are:

1. amphoteric

• Which metal is used in thermite process because of its activity?

1. Aluminium

• The most electronegative element of group V-A is:

1. N

• Alpha decay of the Radium gives:

1. Radon

• Which of the following is a typical transition metal?

1. Co

• Which one is the heterocyclic compound of oxygen?

1. Furan

• Preparation of vegetable ghee involves:

1. Hydrogenation

• Which compound is the most reactive one?

1. Ethene

• Which one of the following is not a nucleophile?

1. BF₃

•  Which one is a dihydric alcohol?

1. Glycol

• Which of the following will react with both aldehydes and ketones?

1. Grignard's reagent

•  Ketones are prepared by the oxidation of:

1. Secondary alcohol

• Which of the following is not a fatty acid?

1. Phthalic acid

Q.2 Write short answers. (any eight)

1. Give two similarities and two differences of hydrogen with IA group elements.
2. Why diamond is bad conductor of electricity?
3. Define each with one example
   1. primary alkyl halide
   2. Secondary alkyl halide
4. Give reactions of ethyl bromide with
   1. CH₃COQNa
   2. Zn + HBr
5. Give names of any four steps involved in neutral sulphite semi chemical process?
6. Write down reactions involved in first 24 hours during setting of cement?
7. What is action of heat on orthophosphoric acid?
8. Give reactions of P₂0₅ with:
   1. HNO₃
   2. C₂H₅OH
9. Convert acetic acid into acetone?
10. Define with examples:
    1. Tautomerism
    2. Cracking of petroleum
11. How amino acid issynthesized? Give one method.
12. What is vital force theory? Who rejected this theory and how.

Q.3 Write short answers. (any eight)

1. What are Clemmensen and Wolf Kishner's reduction reactions? How they differ?
2. What is difference between conjugated protein and derived protein?
3. When double bond and triple bonds are present in a compound, how are they names?
4. What are primary and secondary pollutants? Give examples.
5. Write four uses of blaching powder?
6. What is saponification number?
7. Ho Gypsum is converted into plaster of Paris?
8. What do you know about available chlorine?
9. How wood spirit is prepared from water gas?
10. Write down the structure of:
    1. Lactic acid
    2. Tartaric acid
11. What is biochemical oxygen demand?
12. How lime mortar is prepared? 

Q.4 Write short answers. (any six)

1. Give the structures and names of two condensed ring aromatic hydrocarbons.
2. Give four uses of acetaldehyde.
3. How will you distinguish between aldehydes and ketones?
4. Why CO₂ is acidic in character?
5. What happens when borax is treated with H₂ SO₄.
6. What are interstitial compounds?
7. Give the uses of K₂Cr₂0₇
8. What is Wurtz-Fitting reaction?
9. What is haloform reaction?

Answer any three questions.

Q.5 (A) Explain the construction of Down's cell. Give reactions taking place at cathode and anode?
(B) How will you synthesize the following compounds starting from Ethyne?

1. Acetaldehyde
2. Methylnitrile
3. Ethane
4. Acrylonitrile

Q.6 (A) Why is CO₂ a gas at room temperature while SiO₂ is solid? Explain.
(B) What are aromatic hydrocarbons? How are they classified?

7.(A) Give four reactions of H₂SO₄. as an acid?
(b) Write a note on SN1-reaction of alkyl halides?

8.(A) What are the commercial uses of halogens and their compounds?
(B) How does phenol react with

1. HNO₃
2. H₂ S0₄
3. H₂/Ni
4. NaOH

9.(A) Define atomic orbital hybridization. Explain the structure of ethylene on the basis of hybridization?
(B) What is cannizaro's reaction? Explain with mechanism.

Section—Ill
(Practical)

Answer any three parts.

Q.10 . (A) Write down the qualitative analysis of Zn ⁺² radical in a systematic manner?
(B) Write the qualitattive analysis of Na⁺¹ radical in a systematic manner.

(C)

1. Write the qualitative analysis of Cl^-1 radical in a systematic manner.
2. How 'Palm test' is performed?
3. How will you detect 'N' and 'S' in an organic compound?
4. Write the material required, equation and procedure for the preparation of 'lodoform'.