Calculate the average atomic weight of an element (X) containing three isotopes X56, X57 and X59 and natural occurrence of these isotopes are 90%, 8% and 2% respectively.

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What is the misconceptions about resonance?

Many misconceptions are associated with resonance and the same need to be dispelled. 

You should remember that : 

(1) The cannonical forms have no real        existence.

(2)The molecule does not exist for a       certain fraction of time in one     cannonical form and for other       fractions of time in other cannonical       forms.

(3) There is no such  equilibrium between the cannonical forms as we have between tautomeric forms (keto and enol) in tautornerisrn. 

(4) The molecule as such has a single       structure which is the resonance       hybrid of the cannonical forms and       which cannot as such be depicted by     a single Lewis structure.

(5) Resonance is a theoratical concept. The resonating structure have no physical reality, i.e., they do not actually exist. Only the hybrid structure exists. The hybride structure can not be represented on the paper but resonating structure can be represented.

Releted Questions:

(1) What is the structure of Blue vitriol (CuSO4) .5H2O also represent the H-Bond with water molecules?

(2) Why bond angle of hydrides of group 15, decreases down the group?

(3) Why SF6 behave inert towards hydrolysis?

(4) What are the SESQUI OXIDES ? give the examples.

(5) Arrange in increasing order of extent of hydrolysis [ CCI4, MgCI2, AICI3, PCl5, SiCI4].

(6) Why SF6 behave inert towards hydrolysis?

(7) Although Sulphur contain vacant d-orbital but SF6 does not under go hydrolysis. Why ?

(8) Phosphorus can form PCl5 but nitrogen can not form NCl5 why?

(9) Why PCl3 hydrolysed while NCl3 can not be hydrolysed?

(10) CCl4 can not be hydrolysed but SiCl4 can be. Why?

(11) Silianol (SiH3OH) is more acidic than methanol (CH3OH) why?

Salicylic acid is a stronger acid than Benzoic acid. Why?

Salicylic acid is a stronger acid than benzoic acid. It is due to the fact that in salicylate ion (conjugate base of salicylic acid) intramolecular H-bond formation takes place which makes the conjugate base more stable.

Related Questions:

1.                 Highly branched carboxylic acids are less acidic than unbranched acids. Explain why?

2.                 Benzamide is less easily hydrolysed than methyl benzoate. Why ?

3.                 Alcohols and Phenols both are acidic but phenols are more acidic. Why?

4.                 Which is more acidic 2-methyl benzoic acid , 3-methyl benzoic acid or 4-methyl benzoic acid.?

5.        Why is o-toluic acid (2-methyl benzoic acid) stronger than benzoic acid ?

6.                 What is the ortho effect? Why are nearly all ortho substitute benzoic acids (except some groups) stronger acid than benzoic acid?

7.                 Name of groups which does not show ortho effect in benzoic acid?

8.                 Why Picric acid (2,4,6-trinitrophenol) is weak acid then expected ?

9.                 What is Steric Inhibition of Deprotonation effect ? Or SID effect ?

10.           Alcohols and Phenols both are acidic but phenols are more acidic. Why?

11.           Among orthochlorophenol and orthofluorophenol, which will be a stronger acid and why?

12.           Why The phenoxide ion is more stable than phenol ?

13.           What is correct acidic strengths order of the haloforms acids ? Give correct explanation.

14.           Lower aliphatic acids having 1 to 5 carbons are soluble in water but higher fatty acids having six or more than six carbon are insoluble in water but soluble in alcohol. Explain.

15.           Phenoxide ion is more stable than an alkaoxide. why?

16.           Why does aqueous sodium bicarbonate solution dissolve carboxylic acids but not phenol though they are also acidic ?