Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Chemistry

Assertion: N, N-Diethylbenzene sulphonamide is insoluble in alkali.

Reason: Sulphonyl group attached to nitrogen atom is strong electron-withdrawing group.

Which of the following polymer is biodegradable?

Which of the following polymer can be formed by using the following monomer unit?

Which of the following monomers form biodegradable polymers?

(i) 3-hydroxybutanoic acid + 3-hydroxypentanoic acid

(ii) Glycine + amino caproic acid

(iii) Ethylene glycol + phthalic acid

(iv) Caprolactum

Give reasons to support the answer:

Presence of Alpha hydrogen in aldehydes and ketones is essential for aldol condensation.

Cross aldol condensation occurs between

Give reason for the following:

During the electrophilic substitution reaction of haloarenes, para-substituted derivative is the major product.

Name the suitable alcohol and reagent, from which 2-Chloro-2-methyl propane can be prepared.

Write the equations for the following reaction:

Tert butyl chloride is treated with sodium ethoxide.

Give reasons for the following observation:

Aniline is acetylated before nitration reaction.

Give reasons for the following observation:

Aniline does not react with methyl chloride in the presence of anhydrous AlCl₃ catalyst.

Write the reaction occurring at anode and cathode and the products of electrolysis of aq KCl.

Convert the following:

Acetaldehyde to But-2-enal

Predict the reagent for carrying out the following transformations:

Ethanal to 3-hydroxy butanal

Which of the following reactions are feasible?

Which of the following does not give aldol condensation reaction?

Write the mechanism of the following reaction:

\[\ce{2CH3CH2OH ->[H^+][413 K] CH3-CH2-O-CH2-CH3 + H2O}\]

Assertion (A): Chlorobenzene is resistant to electrophilic substitution reaction.

Reason (R): C-Cl bond in chlorobenzene acquires partial double bond characters due to resonance.

Which of the following compounds will undergo self-condensation in the presence of dilute NaOH solution?

Four half-reactions, I to IV are shown below:

1. \[\ce{2Cl^- -> Cl2 + 2e^-}\]
2. \[\ce{4OH^- -> O2 + 2H2O + 2e^-}\]
3. \[\ce{Na^+ + e^- -> Na}\]
4. \[\ce{2H^+ + 2e^- -> H2}\]

Which two of these reactions are most likely to occur when concentrated brine is electrolysed?