Assertion : Like bromination of benzene, bromination of phenol is also carried out in the presence of Lewis acid. Reason : Lewis acid polarises the bromine molecule.

Write equations of the following reactions : Bromination of anisole in ethanoic acid medium.

Aryl chlorides and bromides can be easily prepared by electrophilic substitution of arenes with chlorine and bromine respectively in the presence of Lewis acid catalysts. But why does preparation of aryl iodides requires presence of an oxidising agent ?

Amount of oxalic acid present in a solution can be determined by its titration with KMnO_4 solution in the presence of H_2SO_4 . The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

All Bronsted bases are also Lewis bases but all Bronsted acid are not Lewis acids. Explain.

Assertion: A solution of Sucrose in water is dextrorotatory but on hydrolysis in presence of little hydrochloric acid it becomes laevorotatory. Reason : Sucrose on hydrolysis gives unequal amounts of glucose and fructose as a result of which change in sign of rotation is observed.

These questions consist of two statements each,printed as Assertion and Reason.While asnwering these questions you are required to chose any one of the following four responses. If both Assertion and Reason are true and Reason in correct explanation of Assertion. If both assertion and Reason are true but reason is not correct explanation of Assertion. If Assertion is true but Reason is false. If both Assertion and Reason are false. Assertion:There are 4 carbon atoms in an oxaloacetic acid molecule,which jions with an acetyl group during step I Krebs' cirtic acid cycle. Reason:There are 6 carbon atoms in citric acid molecule.

In these question, a statement of asertion followed by a statement of reason is given .Choose the correct answer out of the following choices: Assertion and reason both are correct statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Assertion:A solution of sucrose in waer s dextro-rotatory.But on hydrolysis in the presense of a little hydrochloric acid,it becomes laevo - rotatory. Reason:Sucrose on hydrolysis gives unequal amounts of glucose and fructose.As a result of this ,cnage is sign of rotation is observed.

An organic compound A with molecular formula C_8H_8O gives positive DNP and iodoform tests. It does not reduce Tollen’s or Fehling’s reagent and does not decolourise bromine water also. On oxidation with chromic acid (H_2CrO_4) , it gives a carboxy acid (B) with molecular formula C_7H_6O_2 . Deduce the structure of A and B.

Each question contains STATEMENT-I(Assertion) and STATEMENT-2(Reason).the statement carefully and mark the correct answer accoring to the instrution given below: STATEMENT - 1 : The molescular mass of acetic acid determined by depression in freezing point method in benzene and water was found to be differrent. STATEMENT - 2 : Water is polar and benzene is non-polar.

The bromination of acetone that occurs in acid solution is represented by the equation CH_3COCH_3(aq) + Br_3(aq) rarr CH_3COCH_2Br(aq) + H^(+)(aq) + Br^(-)(aq) These kinetic data were obtained for given reaction concentrations. Based on these data, the rate of reaction is :