The correct order of stability of the superoxides is
KO2 > RbO2 > CsO2
KO2 > CsO2 > RbO2
CsO2 > RbO2 > KO2
RbO2 > CsO2 > KO2
Which of the following fluorides has the lowest melting point?
BaF2
SrF2
CaF2
BeF2
D.
BeF2
Being covalent, BeF2 has the lowest melting point (800°C) while other fluorides melt at around 1300°C.
How many geometrical isomers are possible in the following two alkenes ?
(i) CH3 - CH = CH - CH = CH - CH3
(ii) CH3 - CH = CH - CH = CH - Cl
4 and 4
4 and 3
3 and 3
3 and 4.
Assertion : Electromeric effect is brought into play only at the requirement of the reagent.
Reason : It is a temporary effect in which bond pair is shifted to one of the constituent atoms.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion: Cis-2-butene gives meso-2, 3-butanediol with dilute alkaline KMnO4 solution.
Reason : Dilute alkaline KMnO4 solution gives trans addition with alkenes.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion : The presence of Ag+ enhances the solubility of alkenes in water.
Reason : Alkenes are weakly polar in nature.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false