List of practice Questions

Show that the time required for 99.9% completion in a first-order reaction is 10 times of half-life (t$_{1/2}$) of the reaction.

What happens when ethyl chloride is treated with alcoholic potassium hydroxide?

The presence of –NO$_2$ group at ortho or para position increases the reactivity of haloarenes towards nucleophilic substitution reactions. Give reason to explain the above statement.

Write the IUPAC name of the given compound:

Explain the following terms:
(a) Essential amino acids:
(b) Peptide bond:
(c) Denaturation:

Which one of the given compounds is a stronger acid and why?
CH$_2$FCH$_2$COOH or CH$_3$CHFCH$_2$COOH

Give chemical tests to distinguish between the following pairs of compounds:
(i) Phenol and Benzoic acid:
(ii) Propanal and Propanone:

Write chemical equations for the following reactions:
(a) Hydroboration – Oxidation reaction:
(b) Williamson Synthesis:
(c) Friedel-Crafts Alkylation of Anisole:
(d) Reimer-Tiemann Reaction:

Calculate emf of the following cell at 25°C:
Sn/Sn$^{2+}$(0.001 M) || H$^+$(0.01 M) | H$_2$(g)(1 bar) | Pt(s)
Given: E°(Sn$^{2+}$/Sn) = -0.14 V, E° H$^+$/H$_2$ = 0.00 V (log 10 = 1)

What is meant by a unidentate ligand? Give an example.

Write the electronic configuration for d$^4$ ion if \( \Delta_0 < P \) on the basis of crystal field theory.

Draw the geometrical isomers of the given complex:
[Pt(en)₂Cl₂]²⁺

Two bases are mentioned below, identify which is present in DNA and which one is present in RNA: 
(i) Thymine 
(ii) Uracil.
 

What happens when glucose reacts with bromine water? Write the chemical equation.

Write the stepwise mechanism of nucleophilic addition reactions in the carbonyl compounds.

Arrange the following compounds in the increasing order of their boiling points:
Butane, 1-Bromobutane, 1-Iodobutane, 1-Chlorobutane

Which compound in the given pair will undergo S$_N$2 reaction at a faster rate and why?
CH$_3$–CH$_2$–I and CH$_3$–CH$_2$–Br

18 g of a non-volatile solute is dissolved in 200 g of H$_2$O, and it freezes at 272.07 K. Calculate the molecular mass of the solute (K$_f$ for water = 1.86 K kg mol$^{-1}$).

Define the following terms:
(a) Order of Reaction:
(b) Activation Energy:

Assertion (A): For a Daniell cell, Zn/Zn$^{2+}$(1M) || Cu$^{2+}$(1M)/Cu with \( E_{\text{cell}} = 1.1 \, V \), if the external opposing potential is more than 1.1 V, the electrons flow from Cu to Zn.
Reason (R): Cell acts like a galvanic cell.

Assertion (A): Fructose is a reducing sugar.
Reason (R): Fructose does not reduce Fehling solution and Tollen’s reagent.

Assertion (A): Benzoic acid does not undergo Friedel – Crafts reaction.
Reason (R): Carboxyl group is deactivating and the catalyst aluminium chloride gets bonded to the carboxyl group.

Assertion (A): p-nitrophenol is less acidic than phenol.
Reason (R): Nitro group is electron-withdrawing and helps in the stabilization of p-nitrophenoxide ion.

Match the reagents required for the given reactions: I. Oxidation of primary alcohols to aldehydes (p) \(NaBH_4\)
II. Butan-2-one to Butan-2-ol (q) 85% phosphoric acid at 440 K
III. Bromination of Phenol to 2, 4, 6- (r) PCC Tribromophenol
IV. Dehydration of propan-2-ol to (s) Bromine water propene