List of top Chemistry Questions

Carboxylic acids are more acidic than phenol and alcohol because of:
The moles of methane required to produce 81 g of water after complete combustion is _____ × 10–2 mol. [nearest integer]
Match List - I with List - II 
List-I (Compound)                                              List-II (Shape)
A \(BrF _5\)                                                                    I bent 
B \(\left[ CrF _6\right]^{3-}\)                                                             II square pyramidal
C \(O _3\)                                                                     III trigonal bipyramidal 
D \(PCl _5\)                                                                    IV octahedral 
Choose the correct answer from the optionsgiven below :
Fig. Reaction

Consider the above reaction. The number of π electrons present in the product ‘P’ is _____ .

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A) : Boron is unable to form BF63-
Reason (R) : Size of B is very small
In the light of the above statements, choose the correct answer from the options given below:

An organic compound ‘A’ on reaction with NH3 followed by heating gives compound B. Which on further strong heating gives compound C(C8H5NO2). Compound C on sequential reaction with ethanolic KOH, alkyl chloride and hydrolysis with alkali gives a primary amine. The compound A is :

The product formed in the following reaction.
The product formed in the reaction
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Experimental reaction of \(CH_3Cl\) with aniline and anhydrous \(AlCl_3\) does not give o and p-methylaniline.
Reason (R): The \(–NH_2\)group of aniline becomes deactivating because of salt formation with anhydrous \(AlCl_3\) and hence yields m-methyl aniline as the product.
In the light of the above statements, choose the most appropriate answer from the options given below :
The correct stability order of the following diazonium salt is

When the excited electron of a H atom from n = 5 drops to the ground state, the maximum number of emission lines observed are ____.

Which one of the following is a water soluble vitamin, that is not excreted easily?
When sugar ‘X’ is boiled with dilute H2SO4 in alcoholic solution, two isomers ‘A’ and ‘B’ are formed. ‘A’ on oxidation with HNO3 yields saccharic acid whereas ‘B’ is laevorotatory. The compound ‘X’ is :
For the below given cyclic hemiacetal (X), the correct pyranose structure is :
cyclic hemiacetal (X)
At 300 K, a sample of 3.0 g of gas A occupies the same volume as 0.2 g of hydrogen at 200 K at the same pressure. The molar mass of gas A is _____ g mol–1. (nearest integer)
Assume that the behaviour of gases as ideal.
(Given: The molar mass of hydrogen (H2) gas is 2.0 g mol–1).
The pair, in which ions are isoelectronic with \(Al^{3+}\) is:
Among the following species
N2,N2+,N2−,N22−,O2,O2+,O2−,O22−
the number of species showing diamagnetism is ________.
The difference in the reaction of phenol with bromine in chloroform and bromine in water medium is due to :
Phenol on reaction with dilute nitric acid, gives two products. Which method will be most efficient for large scale separation?
The major product in the reaction is:
The major product in the reaction with product2-Methyl prop-1-ene
In the following reaction:
In the reaction compound A and B is
The compound A and B respectively are:
Which of the following ketone will NOT give enamine on treatment with secondary amines? [where t-Bu is –C(CH3)3]
lf the work function of a metal is 6.63 × 10–19 J, the maximum wavelength of the photon required to remove a photoelectron from the metal is ______ nm. (Nearest integer)
[Given : h = 6.63 × 10–34 J s, and c = 3 × 108 m s–1]
The number of terminal oxygen atoms present in the product B obtained from the following reaction is ______.
FeCr2O4 + Na2CO3 + O2 → A + Fe2O3 + CO2
A + H+ → B + H2O + Na+
‘A’ and ‘B’ respectively are: \(A\xrightarrow[(2)Zn-H_2O]{(1)O_3}\)
\(Ethane-1, 2-dicarbaldehyde + Glyoxal/Oxaldehyde\)
\(B \xrightarrow[(2)Zn-H_2O]{(1)O_3}   5 - oxohexanal\)
The formulas of A and B for the following reaction sequence are
formula for reaction