What is sigma resonance or dancing resonance? Sigma resonance or dancing resonance is a special stability mechanism which increases stability of carbocations attached directly to the three membered rings, e.g., cyclopropylmethyl carbocation. Why it occurs? In cyclopropane, all the carbon is sp3 hybridized and the bond angle for the same should be 109°28′, but the […]
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Phenol and phenoxide ion both are stabilized by resonance. In case of phenol, the lone pair on oxygen atom get delocalize over the benzene ring and this causes a charge separation, i.e., positive charge on oxygen atom while negative charge is on the benzene ring. This type of resonance structures have small contributions to the
Why is the phenoxide ion more stable than phenol? Read More »
Question: The order of heat of hydrogenation in the following compounds: Solution: Read more: The correct relation between the bond lengths a and b is:
The order of heat of hydrogenation in following compounds. Read More »
SN1 and SN2 products are same with (excluding stereoisomer): (a) In SN1 reaction, rearrangement of carbocation occurs, so it gives different product in SN1 reaction than SN2. (b) The given halide is tertiary, so here SN1 reaction is possible but SN2 is not possible due to steric hindrance. (c) Here secondary halide is given, it
Sn1 and Sn2 products are same with (excluding stereoisomers): Read More »
Carbylamine reaction is in the chapter amines in class 12. It is helpful for the detection of primary amines which give foul smell. Let’s read how and why it give foul smell! What is Carbylamine reaction? Carbylamine reaction is the reaction in which aliphatic or aromatic primary amines on heating with chloroform and ethanolic potassium
How carbylamine reaction give foul smelling compound? Read More »
Which species has the maximum number of lone pairs of electrons on the central atom? (a) ClO3– (b) XeF4 (c) SF4 (d) I3– First of all, let’s discuss the term lone pair, hybridisation and bond pair What is lone pair? A pair of electrons occupying an orbital in an atom or molecule and not directly
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To find the pH of the resulting solution when pH of 20 ml of 0.2 M HNO3 mixed with 40 ml of 0.1 M Ba(OH)2, find the number of moles of H+ and OH– for each given compound. We know, Moles = Molarity x Volume Since, Ba(OH)2 on dissociation give 2 OH– ion while HNO3 give
What is the pH of 20 ml of 0.2 M HNO3 mixed with 40 ml of 0.1 M Ba(OH)2? Read More »
Ortho effect refers mainly to the set of steric effects and some bonding interactions along with polar effects caused by the various substituents which are in a given molecule altering its chemical properties and physical properties. The ortho effect is associated with benzene compounds. What is ortho effect? Ortho effect is a special type of
Why ortho effect will make you question acidic character? Read More »
What is the product formed when ethoxybenzene reacts with HBr? Ethoxybenzene is Ph-O-C2H5. When it reacts with HBr, the products formed are phenol and ethyl bromide. The reaction and mechanism of the reaction of ethoxybenzene with HBr is as: What is Substitution reaction? The substitution reaction is defined as a reaction in which the functional
Easy Reaction of ethoxybenzene with HBr? Read More »
