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

Classify the following as primary, secondary and tertiary alcohol:

\[\begin{array}{cc}
\ce{CH3}\phantom{.}\\
|\phantom{....}\\
\ce{CH3 - C - CH2OH}\\
|\phantom{....}\\
\ce{CH3}\phantom{.}
\end{array}\]

Identify allylic alcohols in the following examples.

Give the structures and IUPAC names of monohydric phenols of molecular formula C₇H₈O.

Why are pentahalides more covalent than trihalides?

Why is BiH₃ the strongest reducing agent amongst all the hydrides of Group 15 elements?

Considering the parameters such as bond dissociation enthalpy, electron gain enthalpy and hydration enthalpy, compare the oxidising power of F₂ and Cl₂.

Discuss the general characteristics of Group 15 elements with reference to their electronic configuration, oxidation state, atomic size, ionisation enthalpy and electronegativity.

Discuss the trends in chemical reactivity of group 15 elements.

Why does R₃P=O exist but R₃N=O does not (R = alkyl group)?

Nitrogen exists as diatomic molecule and phosphorus as P₄. Why?

Write main differences between the properties of white phosphorus and red phosphorus.

Why does nitrogen show catenation properties less than phosphorus?

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

p-nitrophenol, ethanol, phenol (acidic character)

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

Propanol, Propane, Propanal (boiling point)

For a reaction R ---> P, half-life (t_1/2) is observed to be independent of the initial concentration of reactants. What is the order of reaction?

Define the following : Narrow spectrum antibiotics

Based on the nature of intermolecular forces, classify the following solids:

Sodium sulphate, Hydrogen

Why does copper obtained in the extraction from copper pyrites have a blistered appearance?

Arrange the following in the increasing order of property mentioned :

NH₃, PH₃, AsH₃, SbH₃, BiH₃ (Base strength)

Among the hydrides of Group-15 elements, which have the lowest boiling point?