Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

Assertion (A): The half-life of a reaction is the time in which the concentration of the reactant is reduced to one-half of its initial concentration.

Reason (R): In first-order kinetics, when the concentration of reactant is doubled, its half-life is doubled.

Arrange the isomeric dichlorobenzene in the increasing order of their boiling point and melting points.

Arrange the decreasing order of pKb values.

\[\ce{C6H5NH2, C6H5NHCH3, C6H5CH2NH2, CH3NH2, NH3}\]

Write the structure of the following organic halogen compound.

1,4-Dibromobut-2-ene

Indicate the types of isomerism exhibited by the following complexes and draw the structures for this isomer:

Pt(NH₃)(H₂O)Cl₂

What is the basicity of H₃PO₄?

Write the structure of the following organic halogen compound.

4-tert-Butyl-3-iodoheptane

Write the structure of the following organic halogen compound.

4-tert-Butyl-3-iodoheptane

Write the structure of the following organic halogen compound.

4-tert-Butyl-3-iodoheptane

What is the basicity of \[\ce{H3PO4}\]?

Write the structure of the following organic halogen compound:

4-tert-Butyl-3-iodoheptane

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

 \[\ce{CH3 C(C2H5)2CH2Br}\]

Write the structure of the following organic halogen compound.

4-tert-Butyl-3-iodoheptane

Write the structure of the following organic halogen compound.

4-tert-Butyl-3-iodoheptane

Calculate the half-life of a first order reaction from the rate constant given below:

2 min⁻¹

Calculate the half-life of a first order reaction from the rate constant given below:

4 year⁻¹

A first order reaction takes 40 min for 30% decomposition. Calculate t_1/2.

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

Ethanal and Propanal

Write the structure of an isomer of compound C₄H₉Br which is most reactive towards S_N1 reaction

In non-ideal solution, what type of deviation shows the formation of maximum boiling azeotropes?