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

What happens when reaction:

Aniline reacts with chloroform in the presence of alcoholic potassium hydroxide

Cross aldol condensation occurs between

What is the no. of possible isomers for the octahedral complex [Co(NH₃)₂(C₂O₄)₂]?

Explain how and why will the rate of reaction for a given reaction be affected when a catalyst is added.

Using Valence bond theory, explain the following in relation to the paramagnetic complex [Mn(CN)₆]³⁻ 

1. type of hybridization
2. magnetic moment value
3. type of complex – inner, outer orbital complex

Identify the major product formed when 2-cyclohexylchloroethane undergoes a dehydrohalogenation reaction. Name the reagent which is used to carry out the reaction.

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

4-Nitrobenzoic acid, benzoic acid, 3,4-Dinitrobenzoic acid, 4-Methoxy benzoic acid (Acid strength)

Convert the following:

Acetaldehyde to But-2-enal

Predict the reagent for carrying out the following transformations:

Ethanal to 3-hydroxy butanal

Using valence bond theory, predict the hybridization and magnetic character of the following:

[CoF₆]^3– [Atomic number of Co = 27]

The conversion of an alkyl halide into an alkene by alcoholic KOH is classified as ______.

Which of the following does not give aldol condensation reaction?

For the reaction 3A `rightarrow` 2B, rate of reaction `+ (d[B])/(dt)` is equal to ______.

Write the hybridisation and magnetic behaviour of [CoF₆]³⁻.

[Given: Atomic number of Co = 27]

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

For the reaction \[\ce{3A -> 2B}\], rate of reaction `-("d"["A"])/"dt"` is equal to ______.

Which one of the following has the lowest pK_a value?

The magnetic moment of [NiCl₄]²⁻ is ______.

[Atomic number: Ni = 28]

For the pair phenol and cyclohexanol, answer the following:

Why is phenol more acidic than cyclohexanol?

[Ni(CO)₄] has tetrahedral geometry while [Ni(CN)₄]²⁻ has square planar, yet both exhibit diamagnetism. Explain.
[Atomic number: Ni = 28]