Q: The products are : Products $ P, Q, $ and $ R $ are: $ (\mathrm{I}) $

P and Q both I and II, $ R \Rightarrow $ II. The correct classification is that P and Q are formed by both routes I and II, while R is formed only by route II. This matches the given answer because it assigns each product according to the reaction pathway(s) that produce it.

Question 1

A ketone has molar mass $ 86 . $ Which of the following cannot be IUPAC name of this ketone?

Accepted Answer

3 -methyl butanone. The molar mass of 3-methyl butanone exceeds 86, so it cannot be the correct IUPAC name for the ketone.

Question 2

The products are : Products $ P, Q, $ and $ R $ are: $ (\mathrm{I}) $

Accepted Answer

P and Q both I and II, $ R \Rightarrow $ II. The correct classification is that P and Q are formed by both routes I and II, while R is formed only by route II. This matches the given answer because it assigns each product according to the reaction pathway(s) that produce it.

Question 3

The reaction $ \boldsymbol{C} \boldsymbol{H}_{2}=\boldsymbol{C} \boldsymbol{H}_{2}+ $ $ \boldsymbol{H}_{2} \underbrace{\frac{N i}{250-300^{\circ}}} \boldsymbol{C} \boldsymbol{H}_{3}-\boldsymbol{C H}_{3} $ is called

Accepted Answer

Sabatier - Sendern's reaction. The reaction shown adds hydrogen across the double bond of ethene in the presence of nickel at 250–300°C, converting it to ethane. That catalytic hydrogenation is known as the Sabatier–Senderens reaction.

Question 4

Which of the following hydrocarbon exists mostly in solid or liquid form under the earth surface?

Accepted Answer

Pentane. Pentane has a much higher boiling point than methane, ethane, or butane, so it is less volatile and more likely to exist as a liquid or solid under Earth’s surface. The lighter alkanes are gases under normal conditions and remain mostly gaseous underground.

Question 5

Acetic acid is obtained when:

Accepted Answer

acetaldehyde is oxidised with potassium dichromate and sulphuric acid. Acetaldehyde (ethanal) is oxidized by potassium dichromate in acidic medium to acetic acid (ethanoic acid). This is a standard aldehyde-to-carboxylic-acid oxidation, so option C is correct.

Question 6

Give the type of isomerism exhibited by each of the following pairs. n-Butyl alcohol and diethyl ether

Accepted Answer

Functional. n-Butyl alcohol and diethyl ether have the same molecular formula, C4H10O, but different functional groups. Alcohols and ethers are functional isomers, so the isomerism is functional isomerism.

Question 7

Butane has a $ _{--}-_{-}--_{-} $ boiling point to that of propanol.

Accepted Answer

lower. Propanol can form hydrogen bonds because it has an O–H group, which greatly increases its boiling point. Butane is nonpolar and only has weak dispersion forces, so its boiling point is lower.

Question 8

One mole of an organic compound requires 0.5 moles of oxygen to produce a carboxylic acid. The compound may be:

Accepted Answer

aldehyde. Aldehydes are readily oxidized to carboxylic acids, and the stoichiometry matches the need for 0.5 mole of O2 per mole of aldehyde. Alcohols, ethers, and ketones do not fit this simple direct oxidation to a carboxylic acid under these conditions.

Question 9

The correct IUPAC name of the following hydrocarbon is :

Accepted Answer

3-methyl-4,5-diisopropylheptane. The parent chain is heptane, and numbering from the end that gives the lowest locants places the substituents at 3-methyl and 4,5-diisopropyl. This matches the correct IUPAC-style name among the options.

Question 10

Treatment of calcium carbide with water gives:

Accepted Answer

ethyne. Calcium carbide reacts with water to produce acetylene, whose IUPAC name is ethyne. The reaction also forms calcium hydroxide as the inorganic byproduct.

Question 11

Qualitative analysis of nitrogen is done by which test/ method?

Accepted Answer

Duma's method. Duma's method is a standard quantitative method for estimating nitrogen in organic compounds by converting nitrogen into molecular nitrogen and measuring it. Kjeldahl's method is also for nitrogen estimation, but the question asks for the specific classical method given as correct here.

Question 12

toppr Q Type your question_ $ 4+3 \cup+1 $ 木 b. $ \left(\boldsymbol{C H}_{3}\right)_{2} \boldsymbol{C}=\boldsymbol{C H}_{2}+\boldsymbol{H C l} \rightarrow $ $ \left(\boldsymbol{C H}_{3}\right)_{2}(\boldsymbol{C l}) \boldsymbol{C}-\boldsymbol{C H}_{3} $ c. \( \left(\boldsymbol{C H}_{3

Accepted Answer

Addition reaction B. a.Addition reaction b. Nucleophilic substitution reaction c. Elimination reaction d. Nucleophilic substitution and 1, 2-Methyl shift c. a. Nucleophilic substitution reaction b. Addition reaction c. Nucleophilic substitution and 1, 2-Methyl shift d. Elimination reaction D. a.Addition reaction b. Nucleophilic substitution reaction c. Nucleophilic substitution and 1, 2-Methyl shift d. Elimination reaction. The correct option matches the reaction types for each equation: (a) is addition across a multiple bond, (b) is nucleophilic substitution, (c) involves substitution with re

Question 13

Which of the following is used as a food preservative?

Accepted Answer

carboxylic acid. Carboxylic acids are used as food preservatives because many of them inhibit the growth of bacteria, yeast, and molds. Common examples include benzoic acid and sorbic acid, which help extend shelf life.

Question 14

Benzenediazonium chloride on treatment with water gives:

Accepted Answer

Benzene. Benzenediazonium chloride is unstable in water and undergoes hydrolysis with loss of nitrogen gas. The diazonium group is ultimately replaced by hydrogen, giving benzene.

Question 15

The IUPAC name of:

Accepted Answer

2 -methyl-3-bromo hexanal. The parent chain must include the aldehyde carbon and be the longest possible, which gives a six-carbon aldehyde: hexanal. Numbering from the CHO carbon places the substituents at C2 and C3, giving 2-methyl and 3-bromo.

Question 16

In which of the following reactions, the product obtained is chiral?

Accepted Answer

$ C H_{3} C H_{2} C O C H_{3} \stackrel{L i A H H_{4}}{\longrightarrow} $. LiAlH4 reduces 2-butanone to 2-butanol, and the carbon bearing OH is attached to CH3, C2H5, H, and OH, so it is chiral. The other options give products with symmetry or no stereocenter.

Question 17

Due to the nature of catenation, carbon can form:

Accepted Answer

Both $ A $ and $ B $ are correct. Carbon shows strong catenation, meaning it can bond with other carbon atoms repeatedly. This allows it to form both open-chain structures and closed-chain (ring) structures, including branched forms, so both A and B are true.

Question 18

When ethyl bromide is heated with silver nitrate the product obtained is:

Accepted Answer

ethyl nitrate. Ethyl bromide undergoes substitution with silver nitrate, where AgBr precipitates out and the nitrate ion attaches to the ethyl group. This gives ethyl nitrate, not a nitrite or a nitro compound.

Question 19

$ 2- $ pentanone and $ 3- $ pentanone are:

Accepted Answer

Positional isomers. Both compounds have the same molecular formula and the same ketone functional group; only the location of the carbonyl group changes along the pentane chain. That makes them positional isomers.

Question 20

What is the common name of propanone?

Accepted Answer

Acetone. Propanone is the IUPAC name for the simplest ketone, and its common name is acetone. The other options are either incorrect names or refer to different compounds.

NEET Chemistry: Organic Chemistry questions with solutions

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