Question on Structural Identification

Two compounds A and B, have the same molecular formula C₆H₁₀. Both the compounds decolourise Br₂ in CCl₄. Compound A gives a precipitate when treated with silver nitrate in ammonia, while B does not. A gives n-hexane when treated with excess of H₂/Pd. When treated with excess of H₂/Pd, B gives a product with formula C₆H₁₂. When A is oxidised with hot alkaline KMnO₄ and the resulting solution acidified, the only organic product that can be isolated is n-pentanoic acid. Similar oxidation of B gives only adipic acid. What are the names of A and B?

Question on Photochemical Chlorination

A saturated hydrocarbon (A) burns in oxygen to give carbon dioxide and water. Approximately twice as much CO₂ as H₂O (by weight) is produced by this combustion, the actual factor being 2.03. Photochemical chlorination of the (A) by 2.0 equivalents of chlorine gives a mixture of mono-, di- and trichloro compounds, along with small amounts of higher chlorination products. Only one monochloro isomer is formed, but there are two dichloro isomers and three trichloro isomers produced in the reaction. What is the name of (A)?

Question on Isomerism

Two isomeric compounds (A) and (B), C₁₀H₁₂O don’t have –OH group and discharge colour of bromine water. Each is vigorously oxidised to 4-methoxy benzoic acid. Ozonolysis of (A) and (B) give the same product. Which type of isomerism is present in (A) and (B)?

Question on Equilibrium Constant

All acid-base reactions do not go to completion. Reaction between a strong acid and a strong base is considered to be almost complete as the concentrations of the reactants are negligibly smaller compared to that of the products. When Naoh is titrated against HNO₃ the end point occurs when the equivalents of the acid equal the equivalents of the base and the pH of the resulting solution becomes zero. What would be the possible equilibrium constant for this reaction?

Question on Gas Pressure

Equal weights of ethane and hydrogen are mixed in an empty container at 25°C. What is the fraction of the total pressure exerted by hydrogen in the mixture?

Question on Qualitative Analysis

When a salt is heated with dil. H₂SO_­4 in the presence of little KMnO₄, the pink colour of KMnO₄, is discharged. Which out of (a) carbonate ion and (b) sulphite ion is the possible anion in the salt?

Question on Isomerism

How many isomers are possible for the compound with molecular formula C₂BrClFI?

Question on Functional Group Interconversion

What are the reagents A and B in the following reaction?

Question on Nucleophilic Substitution Reaction

The reaction between CH₃I and OH^- produces CH₃OH and I^-, while the reaction between CF₃I and OH^- produced CHF₃ and IO^-. Why?

Question on Isomers

How will you distinguish between Maleic Acid and Fumaric Acid?

Question on Amino Acids

What is the structural feature that distinguishes proline from other alpha-amino acids?

Question on Alkyl Halides

An alkyl bromide with molecular formula, C₅H₁₁Br, on treatment with alcoholic KOH gives pent-2-ene as the only product. What is the name of the alkyl bromide?

Question on Isomers

How many compounds have the formula C₂H₃Cl₃?

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Question on Molecular Mass

The mass of a single molecule of an allotrope of sulphur is 3.20 * 10^–22 g. How many sulphur atoms are present in a molecule of this allotrope?

Question on Molecular Structure

How many sigma bonds (a), pi bonds (b) and lone pairs (c) are in the Lewis structure of hydrazine, N2H4?

Question on Hydration of Alkenes

What is the name of the major product in the following reaction?

Capsaicin

Capsaicin is the active ingredient in Chilli Peppers. It is an alkaloid found in plants belonging to genus Capsicum. Capsaicin produces a burning sensation when it comes in contact with any tissue. Capsaicin possesses antibacterial properties and is found to be effective in curing sinus infections. Capasicin has anti-inflammatory properties and is also found useful to fight against nerve damages as a result of high sugar levels in blood. It also helps to burn fat and lose weight.

The Structure of Capsaicin is given below.

Question on pH

Equal volumes of two solutions of HCl are mixed. One solution has pH = 1 while the other has pH = 5. What will The pH of the solution obtained be?

Question on Electrochemistry

By how many volts will the reduction potential of a hydrogen electrode change when its solution initially at pH = 0 is neutralized to pH = 7?

Question on Gas Laws

A gas cylinder containing cooking gas can withstand a pressure of 14.9 atm. The pressure gauge of the cylinder indicates 12 atm at 27°C. Due to a sudden fire in the building, the temperature starts rising. At what temperature will the cylinder explode?