List of top Chemistry Questions

Which of the following are the Green house gases?
A. Water vapour 
B. Ozone 
C. 1₂ 
D. Molecular hydrogen 
Choose the most appropriate answer from the options given below

Given below are two statements:
Statement I: Tropolone is an aromatic compound and has 8л electrons. 
Statement II: electrons of >C = O group in tropolone is involved in aromaticity. 
In the light of the above statements, choose the correct answer from the options given below

Match the List I with List II
1- Bromopropane is reacted with regents in List I to give products in List II

	List I-Reagent		List II-Product
(A)	KOH(alc)	I	Nitrile
(B)	KCL(alc)	II	Ester
(C)	AgNo2	III	Alkene
(D)	H3CC00Ag	III	Nitroalkane

Choose the correct answer from the options given below:

The major products for the following reaction is

Match the List I with List II

	List I		List II
(A)	Weak intermolecular forces of attraction	I	Hexamethylenedia mine + adipic acid
(B)	Hydrogen bonding	II	AlEt3 + TiCl4
(C)	Heavily branched polymer	III	2-chloro-1, 3-butadiene
(D)	High density polymer	III	phenol+ formaldehyde

choose the correct answer from the options given below:

The covalency and oxidation state respectively of boron in [BF₄]^-, are

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The diameter of colloidal particles in solution should not be much smaller than wavelength of light to show Tyndall effect. 
Reason R : The light scatters in all directions when the size of particles is large enough. 
In the light of the above statements, choose the correct answer from the options given below

Select the option(s) in which rate of SN1 is faster in II than I?

The two structures written below represent 

The percentage of carbon in acetic acid is

Which of the following is/are endothermic reaction(s)?

Diborane undergo unsymmetrical cleavage reactions with:

Which of the following statements is/are correct?

The correct statement(s) about following sugars (X) and (Y) is/are:

Q in the above sequence of reactions is

Consider the following species $(\mathrm{I}){\mathrm{S}}_4{\mathrm{O}}_6^{2-}$$(\mathrm{II}){\mathrm{S}}_3{\mathrm{O}}_9$$(\mathrm{III}){\mathrm{S}}_2{\mathrm{O}}_5^{2-}$$(\mathrm{IV}){\mathrm{P}}_3{\mathrm{O}}_9^{3-}$Which of the above species have same number of $X-0-X$ linkages? $(X=P\text{ or }S)$

The addition of HBr to 2-pentene gives

Blackened oil painting can be restored into original form by the action of:

Which one of the following observations is not true when a mixture of KCl, K2Cr2O7 and conc. H2SO4 is warmed carefully?

Consider the following diagram and mark the correct answer.

Choose the correct statement:

Bond dissociation energy of $XY,X_2$, and $Y_2$ (all diatomic molecules) are in the ratio of $1:1:0.5$ and $\mathrm{\Delta }{H}_f$ of $XY$ is $-100kJ{mol}^{-1}$. The bond dissociation energy of $X_2$ is $100x.$ The value of $x$ is

From the diagram

Δ_rH for the reaction C → A is

Match the following:

I.	Zn2+	i.	d8 configuration
II.	Cu2+	ii.	colourless
III.	Ni2-	iii.	μ=1.73BM