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

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]

Why is the α-hydrogens of aldehydes and ketones are acidic in nature?

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:

Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:

\[\ce{CH3 C(CI) (C2H5)CH2CH3 }\]

Give the structure of the product you would expect when the following alcohol reacts with HCl–ZnCl₂.

2-Methylbutan-2-ol

Give the structure of the product you would expect when the following alcohol reacts with HBr.

Butan-1-ol

Give the structure of the product you would expect when the following alcohol reacts with HBr.

2-Methylbutan-2-ol