List of top Chemistry Questions

Write the reaction involved in the following:

Friedel-Crafts acylation of anisole
Give reason for the following:

Nucleophilic addition of ammonia and its derivatives does not occur with carbonyl group in strongly acidic medium.
Write the reaction involved in the following:

Reimer-Tiemann reaction
Write the reaction involved in the following:

Kolbe's reaction
Write the reactions of D-Glucose with the following:

(a) HI
(b) \(Br_2\) water
(c) Conc. \(HNO_3\)
Give reason for the following:

Carboxylic acids have higher boiling point than alcohols of comparable molecular masses.
What type of battery is Mercury cell? Why is it more advantageous than dry cell? Write overall reaction taking place in Mercury cell.
Calculate the boiling point of a solution containing 0.61 g of benzoic acid (Molar mass = 122 g mol\(^{-1}\)) in 5 g of \(CS_2\) in which it dimerises to the extent of 88%. The boiling point and \(K_b\) of \(CS_2\) are 46.2 \(^\circ C\) and 2.3 K kg mol\(^{-1}\) respectively.
Give reason for the following:

Alpha (\(\alpha\)) hydrogens of aldehydes and ketones are acidic in nature.
Answer the following:

(i) Why is the Equilibrium Constant \(K_c\) related to \(E^\circ_{cell}\) and not to \(E_{cell}\)?

(ii) Two metals 'A' and 'B' have standard electrode potential values of \(-0.24\) V and \(+0.80\) V respectively. Which of these will liberate hydrogen gas from dil. \(H_2SO_4\)?

(iii) Write the cell reaction which occurs in lead storage battery when it is in charging.
(i) Give a chemical test to show that \([Co(NH_3)_5SO_4]Cl\) and \([Co(NH_3)_5Cl]SO_4\) are ionisation isomers.

(ii) What is meant by the 'Chelate effect'? Give an example.
For the first order thermal decomposition reaction, following data was obtained:

\(C_2H_5Cl(g) \rightarrow C_2H_4(g) + HCl(g)\)

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Calculate rate constant.
[Given: log 3 = 0.48]
Following reaction takes place in one step:

\(2A + B \rightarrow 2C\)

How will the rate of above reaction change if the volume of the reaction vessel is decreased to one third of its original volume? Will there be any change in the order of reaction with the reduced volume?
Write IUPAC names of the following coordination compounds:

(i) \([Ag(NH_3)_2][Ag(CN)_2]\)

(ii) \(K_3[Fe(C_2O_4)_3]\)
Why are haloarenes less reactive towards nucleophilic substitution reaction? Give two reasons.
What will happen to the boiling point of the solution on mixing phenol and aniline?
What type of deviation from Raoult's law is shown by a mixture of phenol and aniline? Give reason.
Assertion (A): It is not possible to separate the components of an azeotrope by fractional distillation.
Reason (R): Components of an azeotrope have the same composition in liquid and vapour phase and boil at a constant temperature.
Which of the following amines has lowest \(pK_b\) value?
Assertion (A): Actinoids show wide range of oxidation states.
Reason (R): Actinoids are radioactive in nature.
Assertion (A): The presence of −OH group in phenols directs the incoming group to meta position in the ring.
Reason (R): −OH group in phenols activates the aromatic ring towards electrophilic substitution reaction.
At low temperature, phenol reacts with dil. \(HNO_3\) to yield
Which of the following is 'not' true about enantiomers?
The secondary valency of Co in the complex \([Co(NH_3)_5(NO_2)]^{2+}\) is
Aniline on direct nitration yields