List of top Chemistry Questions

The sequence of reagents required to convert ethyl bromide to propanal is:
What are X, Y, Z in the following reaction sequence respectively?
Gattermann-Koch reaction
A Grignard reagent (X) on reaction with carbonyl compound (Y) followed by hydrolysis gave Z. Z reacts with conc. HCl at room temperature. X and Y respectively are
What are X and Y respectively in the following reactions?
bromination under UV light
Which of the following acts as intracellular messengers?
Which of the following is incorrect?
At 300 K, the \( E^\ominus_{cell} \) of \[ \text{A(s)} + \text{B}^{2+}(\text{aq}) \rightleftharpoons \text{A}^{2+}(\text{aq}) + \text{B(s)} \] is 1.0 V. If \( \Delta_r S^\ominus \) of this reaction is 100 J K\(^{-1}\), what is \( \Delta_r H^\ominus \) (in kJ mol\(^{-1}\)) of this reaction?
(F = 96500 C mol\(^{-1}\))
Which of the following is a lung irritant?
Identify the correct sets:
(i) Boron fibres- bulletproof vest
(ii) Metal borides- protective shields
(iii) Borax- glass wool
The number of alicyclic compounds from the following is: Cyclohexene, Anisole, Pyridine, Tetrahydrofuran, Biphenyl
Which of the following, on thermal decomposition, form both acidic and basic oxides along with O\(_2\)?
(i) NaNO3
(ii) Ca(NO3)2
(iii) Be(NO3)2
(iv) LiNO3
A 10 L vessel contains 1 mole of an ideal gas with pressure of P(atm) and temperature of T(K). The vessel is divided into two equal parts. The pressure (in atm) and temperature (in K) in each part is respectively.
Which of the following sequence of reagents convert benzaldehyde to 4-chlorotoluene?
Identify 'Z' in the following sequence of reactions:
nucleophilic substitution
Given below are the two statements regarding chlorobenzene
Statement I: Chlorobenzene is less reactive than benzene towards electrophilic substitution due to the -I effect of chlorine.
Statement II: Because of the -I effect of chlorine, it is a meta directing group.
Phenatole can be prepared from which of the following reactants?
In the following reaction sequence, what are X and Y respectively?
nucleophilic addition of a methoxy group
In the following reaction sequence, what are X and Y respectively?
hydrazine (NH2NH2) reacting with the ester
Which of the following are inner orbital paramagnetic complexes?
inner orbital paramagnetic complexes
Which of the following is used in liquid detergents?
Which of the following is correct statement?
The number average molecular weight (M\(_n\)) of a polymer is 1500. In this polymer, 800 molecules of molar mass 1000, 100 molecules of molar mass 2000 and x molecules of molar mass 5000 are present. What is the value of x?
Phosphodiester linkage that joins nucleotides together is present between which carbons of pentose sugar?
Which of the following does not evolve \( O_2 \) when made to react with water?
Observe the following reaction: \[ xI^- + y \, \, MnO_4^- + z \, H^+ \rightarrow a \, Mn^{2+} + b \, H_2O + cl_2 \] Which of the following are correct?