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Punjab (PTB) · Half book test (board pattern) · Free

2nd Year Chemistry First half Book Paper

85 marks · 3 hours · 55 questions. Covers: 9 chapters (CHAP 17: GROUP 2 ELEMENTS to CHAP 25: ORGANIC SYNTHESIS).

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2nd Year Chemistry First half Book Paper

2nd Year · Chemistry · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 85Time: 3 hours

Q1. Multiple choice questions (Attempt all · 17 × 1 = 17)

  1. Which one of the following does not represent an oxidation?

    1. Ethanal  ethanol

    2. Propan-1-ol propanal

    3. Propan-2-ol propanone

    4. Ethanol  ethanoic acid

  2. What by-product is released during the alkylation of methanamine with bromoethane?

    1. H2O

    2. HBr

    3. HCI

    4. NH3

  3. What was unique about the structure of the molecule picked out by the computer model?

    1. It was exactly identical to penicillin

    2. It lacked any functional groups or heteroatoms.

    3. It possessed a molecular structure different from existing antibiotics.

    4. It was an inorganic metal complex.

  4. When the C-H bond breaks during the restoration of aromaticity, the cleavage is:

    1. Homolytic

    2. Heterolytic

    3. Photolytic

    4. Thermal

  5. During Fehling's test, Cu2+ ions are reduced to which state?

    1. Metallic copper

    2. Cu1+ ions

    3. Cu3+ ions

    4. Complex copper salt

  6. Chirality is also commonly referred to as:

    1. Handedness

    2. Polarity

    3. Isomerism

    4. Symmetry

  7. If a complex ion is represented as [Co(NH3)5Cl]n, where Cobalt is in the +3 oxidation state, what is the value of n?

    1. +3

    2. +2

    3. +1

    4. -2

  8. Which of the following is explicitly mentioned as a factor affecting reactivity alongside bond energy?

    1. Boiling point

    2. Surface area

    3. Bond polarity

    4. Molecular geometry

  9. Compared to Group 1 metals, Group 2 metals exhibit:

    1. Higher hardness and higher density

    2. Lower hardness and lower density

    3. Lower boiling points and higher solubility

    4. Softness allowing knife cutting and lower melting points

  10. When molten phenol reacts vigorously with sodium metal (Na), the products are:

    1. Sodium phenoxide and hydrogen gas (H2)

    2. Sodium phenoxide and water

    3. Bromophenol and sodium chloride

    4. Benzene and sodium oxide

  11. What type of compound is formed when a primary amine reacts with nitrous acid (HNO2)?

    1. Nitroamine

    2. Insoluble yellow oily liquid

    3. Aliphatic alcohol with nitrogen gas evolution

    4. Quaternary salt

  12. How is a "disconnection" best described?

    1. A physical explosion in a laboratory flask

    2. An imaginary breaking down of bonds on paper

    3. The purification of an unreactive liquid

    4. The separation of a mixture using chromatography

  13. What conditions are sufficient for the complete addition of halogens to benzene?

    1. Lewis acid catalyst

    2. Polar solvents only

    3. UV light and heat

    4. Room temperature in dark

  14. How is HCN gas typically produced during the reaction?

    1. Adding mineral acid to cyanide salt

    2. Oxidation of primary alcohols

    3. Distillation of pure ethanal

    4. Reduction of a ketone

  15. Which of the following compounds has no functional group?

    1. Methanol

    2. Carboxylic acid

    3. Cycloalkane

    4. Glucose

  16. Which of the following square planar complexes exhibits cis-trans isomerism?

    1. [Pt(NH3)4]2+

    2. [Pt(NH3)2Cl2]

    3. [PtCl4]2-

    4. [Ni(CO)4]

  17. What has primarily led to restrictions or banning of DDT in developed countries?

    1. High manufacturing cost

    2. Persistence in the environment

    3. Lack of effectiveness

    4. Bad odor

Q2. Short questions (Attempt any 8 of 12 · 8 × 2 = 16)

  1. Why do Group 2 metals conduct electricity better than Group 1 metals?

  2. Why do transition elements form colored complexes/ions?

  3. Draw the structure of the following: 3-methylpentanal

  4. Why does solubility of Group 2 hydroxides increase in terms of the relative changes in Hohyd and Holattice?

  5. What is the role of a ligand in forming a complex ion, and what type of bond is formed?

  6. What is thalidomide?

  7. What type of chemical process do Group 2 elements undergo during reactions?

  8. Give medicinal importance of cis platin.

  9. Define free radicals with examples.

  10. State one agricultural use of CaCO3, and the chemical principle involved.

  11. What is the chelating effect?

  12. What are isomers? Define isomerism.

Q3. Short questions (Attempt any 8 of 12 · 8 × 2 = 16)

  1. How is C-1 assigned in disubstituted benzene?

  2. 4-methylaniline reacts with HNO2(aq) at 4oC to form compound P. Compound P reacts with NaOH. The product of this reaction is compound Q. Draw the structure of compound P and Q.

  3. Why is the E2 reaction called bimolecular?

  4. Why is -COOH given higher priority than -OH?

  5. Define a tertiary (3o) alcohol

  6. Explain the mechanisms which the chloroalkane will adopt while giving nucleophilic substitution reactions.

  7. What is formed when benzene reacts with chlorine in the presence of UV light and heat?

  8. Why 1-naphthol does not give substitution at position 9 and 10?

  9. What is the natural source of bromomethane (CH3Br)?

  10. What is Friedel-Crafts alkylation?

  11. What was phenol historically used to manufacture regarding hygiene products?

  12. Complete the following equation. C2H5Br + CH3COONa 

Q4. Short questions (Attempt any 6 of 9 · 6 × 2 = 12)

  1. Write the balanced equation for the reaction of aniline with bromine water.

  2. What is a "Target Molecule" (TM)?

  3. Describe a test (a different one in each case) that you could use to distinguish between the following pair of compounds: CH2=CH-CH2-OH and CH3CH2CHO

  4. Explain why glycine is the only standard amino acid that does not exhibit optical activity.

  5. What target organism was chosen to train the machine-learning algorithm to recognize antibacterial traits?

  6. What is the use of benzaldehyde and acetone?

  7. How does a Zwitterion form internally within an amino acid molecule?

  8. Highlight the efficiency of AI screening by comparing the size of the database to the time taken.

  9. Predict the products of the following reaction, write the chemical equation: Chlorobenzene and ethanol

Q5. Long questions (Attempt any 3 of 5 · 3 × 8 = 24)

  1. Explain the acidic and alkaline hydrolysis of alkanenitriles with balanced chemical equations.

  2. Compare the reactivity of halogenoalkanes and halogenoarenes using chloroethane and chlorobenzene as examples.

  3. Give a detailed account of importance of retrosynthesis in organic synthesis.

  4. Define carboxylic acids and explain their important physical properties.

  5. Describe the industrial preparation of quicklime from limestone. Explain the calcination process, reaction conditions, equilibrium control, and major industrial applications.