Science (English Medium) Class 12 - CBSE Important Questions

Which of the following tests/reactions is given by aldehydes as well as ketones?

Write the reaction and IUPAC name of the product formed when 2-Methylpropanal (isobutyraldehyde) is treated with ethyl magnesium bromide followed by hydrolysis.

Write the equations for the following reaction:

Salicylic acid is treated with acetic anhydride in the presence of conc H₂SO₄

A hydrocarbon (A) with molecular formula C₅H₁₀ on ozonolysis gives two products (B) and (C). Both (B) and (C) give a yellow precipitate when heated with iodine in presence of NaOH while only (B) give a silver mirror on reaction with Tollen’s reagent.

1. Identify (A), (B) and (C).
2. Write the reaction of B with Tollen’s reagent.
3. Write the equation for iodoform test for C.
4. Write down the equation for aldol condensation reaction of B and C.

Arrange the following in the increasing order of their property indicated:

Ethanal, Propanone, Propanal, Butanone (reactivity towards nucleophilic addition)

Write the IUPAC name of the following complex:

K₂[PdCl₄]

Explain the following reactions:

Clemmensen reaction

Write the IUPAC name of the following complex:

[Pt(NH₃)₆]Cl₄

Using IUPAC norms, write the formula for the following:

Pentaamminenitrito-N-Cobalt (III)

Using IUPAC norms write the formula for the following:

Tetrahydroxidozincate (II)

Predict the reagent for carrying out the following transformations:

Ethanal to 3-hydroxy butanal

Which of the following does not give aldol condensation reaction?

Which of the following does not give Cannizzaro reaction?

Aldehydes and ketones react with hydroxylamine to form ______.

The reagent that can be used to distinguish acetophenone and benzophenone is ______.

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

Assertion (A): Acetic acid but not formic acid, can be halogenated in the presence of red P and Cl₂.

Reason (R): Acetic acid is a weaker acid than formic acid.

Assertion (A): The final product in Aldol condensation is always α, β-unsaturated carbonyl compound.

Reason (R): α, β-unsaturated carbonyl compounds are stabilised due to conjugation.

Identify A and B:

What is IUPAC name of the ketone A, which undergoes iodo form reaction to give \[\ce{CH3CH = C(CH3)COONa}\] and yellow precipitate of \[\ce{CH3}\]?