PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions for Chemistry

The value of Δ_tG^θ for formation of Cr₂O₃ is −540 kJ mol⁻¹ and that of Al₂O₃ is −827 kJ mol⁻¹. Is the reduction of Cr₂O₃ possible with Al?

Predict conditions under which Al might be expected to reduce MgO.

Write the names of monomers of the following polymers.

Write the names of monomers of the following polymers:

Write the names of monomer of the following polymer:

How can you differentiate between addition and condensation polymerisation?

How is dacron obtained from ethylene glycol and terephthalic acid?

What happens when D-glucose is treated with the following reagent?

HNO₃

Write reactions of the final alkylation product of aniline with excess of methyl iodide in the presence of sodium carbonate solution.

Write chemical reaction of aniline with benzoyl chloride and write the name of the product obtained. 

Write structures of different isomers corresponding to the molecular formula C₃H₉N. Write the IUPAC names of the isomers which will liberate nitrogen gas on treatment with nitrous acid.

How will you convert ethanal into the following compound?

But-2-enoic acid

Give a simple chemical test to distinguish between the following pair of compounds:

Acetophenone and Benzophenone

Give a simple chemical test to distinguish between the following pair of compounds:

Phenol and Benzoic acid

Give a simple chemical test to distinguish between the following pair of compounds:

Benzoic acid and Ethyl benzoate

Give a simple chemical test to distinguish between the following pair of compounds:

Pentan-2-one and Pentan-3-one

Give a simple chemical test to distinguish between the following pair of compounds:

Benzaldehyde and Acetophenone

An organic compound contains 69.77% carbon, 11.63% hydrogen and rest oxygen. The molecular mass of the compound is 86. It does not reduce Tollens’ reagent but forms an addition compound with sodium hydrogensulphite and give positive iodoform test. On vigorous oxidation it gives ethanoic and propanoic acid. Write the possible structure of the compound.

Complete the synthesis by giving missing starting material, reagent or product.

Which alkyl halide from the following pair would you expect to react more rapidly by an S_N2 mechanism? Explain your answer.

CH₃CH₂CH₂CH₂Br or \[\begin{array}{cc}
\ce{CH3CH2CHCH3}\\
\phantom{.....}|\\
\phantom{.......}\ce{Br}\ 
\end{array}\]