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NEET • CHEMISTRY • ORGANIC CHEMISTRY-SOME BASIC PRINCIPLES AND TECHNIQUES

Organic chemistry-some basic principles and techniques practice · Easy

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Showing 1-30 of 153 questions

1 Easy

1 of 153

Remembering +4 | -1

A neutral divalent carbon intermediate produced by the removal of two attached atoms is called :

View answer and explanation

Correct option: D

Carbine

Option D is correct because a carbene is a neutral divalent carbon intermediate with two unshared electrons.

2 Easy

2 of 153

Application +4 | -1

IUPAC name of,

\mathrm{C}{\mathrm{H}_3}\mathrm{CH}\left( {\mathrm{OH}} \right)\mathrm{C}{\mathrm{H}_2}\mathrm{C}{\mathrm{H}_2}\mathrm{COOH}

is :

View answer and explanation

Correct option: A

4-hydroxypentanoic acid

Option A (4-hydroxypentanoic acid) is correct because it correctly identifies the parent chain as pentanoic acid and the hydroxyl group as a substituent at the 4th position.

3 Easy

3 of 153

Understanding +4 | -1

Which of the following alkyl groups has the maximum

+ I

effect

View answer and explanation

Correct option: B

{\left( {C{H_3}} \right)_3}C -

Option B (

{\left( {C{H_3}} \right)_3}C -

) is correct because the +I effect increases with the number of alkyl groups attached to the carbon, as alkyl groups are electron-donating.

4 Easy

4 of 153

Understanding +4 | -1

The best method for the separation of naphthalene and benzoic acid from their mixture is

View answer and explanation

Correct option: B

Crystallisation

The correct answer is Crystallisation because naphthalene and benzoic acid have different solubilities in various solvents, allowing for their separation through crystallization.

5 Easy

5 of 153

Analyzing +4 | -1

Only two isomeric mono chloro derivatives are possible for

View answer and explanation

Correct option: D

2 – Methyl propane

Option D (2 – Methyl propane) is correct because it has only two types of non-equivalent hydrogens, leading to only two possible monochloro derivatives.

6 Easy

6 of 153

Analyzing +4 | -1

Which one of the statements about

\mathrm{H O H}_2 \mathrm{C C H}(\mathrm{OH}) \mathrm{CHO}

is not correct? It

View answer and explanation

Correct option: B

Contains a tertiary alcoholic group

Option B is correct because the given compound, HOCH2-CCH(OH)-CHO, does not contain a tertiary alcoholic group. A tertiary alcohol is bonded to three other carbon atoms, which is not the case here.

7 Easy

7 of 153

Application +4 | -1

The IUPAC name of the compound having the formula

\mathrm{CH} \equiv \mathrm{\;C\;}-\mathrm{\;CH} = \mathrm{C}{\mathrm{H}_2}

is :

View answer and explanation

Correct option: A

1-butene-3-yne

Option A (1-butene-3-yne) is correct because it correctly identifies the longest chain, the positions of the double and triple bonds, and prioritizes the double bond for numbering.

8 Easy

8 of 153

Understanding +4 | -1

Which of the following statement is wrong?

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Correct option: D

In the estimation of carbon, an organic compound is heated with CaO in a combustion tube

Option D is the wrong statement because in the estimation of carbon, an organic compound is heated with CuO (copper oxide) in a combustion tube, not CaO.

9 Easy

9 of 153

Understanding +4 | -1

Which of the following statements for carbanion is correct

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Correct option: D

It is

S{P^3}

hybridized

Option D (It is

S{P^3}

hybridized) is correct because carbanions have three bonding pairs and one lone pair, resulting in a tetrahedral electronic geometry and

S{P^3}

hybridization.

10 Easy

10 of 153

Remembering +4 | -1

The arrangement of atoms that characterises a particular stereoisomer is called :

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Correct option: B

Configuration

Option B is correct because the arrangement of atoms that characterizes a particular stereoisomer is called its configuration. Configuration refers to the fixed spatial arrangement of atoms in a molecule.

11 Easy

11 of 153

Understanding +4 | -1

Lassaigne’s test for the detection of nitrogen fails in

View answer and explanation

Correct option: B

\mathrm{N}{\mathrm{H}_2} - \mathrm{N}{\mathrm{H}_2}.\mathrm{HCl}

Option B (

\mathrm{N}{\mathrm{H}_2} - \mathrm{N}{\mathrm{H}_2}.\mathrm{HCl}

) is correct because the Lassaigne's test requires carbon to be directly bonded to nitrogen for cyanide formation, which is then detected. Hydrazine hydrochloride does not have C directly bonded to N.

12 Easy

12 of 153

Remembering +4 | -1

Who is called the ‘Father of Chemistry’?

View answer and explanation

Correct option: D

Lavoisier

Option D (Lavoisier) is correct because Antoine Lavoisier is widely regarded as the 'Father of Chemistry' due to his contributions to the field, including the discovery of oxygen's role in combustion and respiration.

13 Easy

13 of 153

Application +4 | -1

Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear?

View answer and explanation

Correct option: C

\mathrm{C}{\mathrm{H}_3}-\mathrm{C} \equiv \mathrm{C}-\mathrm{C}{\mathrm{H}_3}

Option C is correct because a linear molecule requires sp hybridization for all central atoms, which is the case for

\mathrm{C}{\mathrm{H}_3}-\mathrm{C} \equiv \mathrm{C}-\mathrm{C}{\mathrm{H}_3}

14 Easy

14 of 153

Analyzing +4 | -1

When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was formed whereas on treatment with neutral

\mathrm{FeCl}_3

, it gave deep red colour which disappeared on boiling and a brown red ppt was formed. The mixture contains

View answer and explanation

Correct option: B

\mathrm{CH}_3 \mathrm{COO}^{-}

\mathrm{NO}_3^{-}

Option B (

\mathrm{CH}_3 \mathrm{COO}^{-}

\mathrm{NO}_3^{-}

) is correct because the brown ring test indicates the presence of nitrate ions, and the reaction with neutral

FeCl_3

indicates the presence of acetate ions.

15 Easy

15 of 153

Application +4 | -1

In the estimation of nitrogen by Duma’s method 0.59 g of an organic compound gave 112 mL nitrogen at NTP. The percentage of nitrogen in the compound is about:

View answer and explanation

Correct option: A

23.7

Option A (

23.7

) is correct because the percentage of nitrogen is calculated using the formula: % Nitrogen = (Volume of N2 at NTP / 22400) * (2 * 14 / Mass of organic compound) * 100.

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16 Easy

16 of 153

Understanding +4 | -1

Among the following orbital bonds, the angle is minimum between :

View answer and explanation

Correct option: B

{p_x}

and

{p_y}

- orbitals

Option B (

{p_x}

and

{p_y}

- orbitals) is correct because p orbitals are oriented at 90 degrees to each other.

17 Easy

17 of 153

Remembering +4 | -1

Vital force theory of the origin of organic compounds was discarded by :

View answer and explanation

Correct option: C

Wöhler’s synthesis

Option C (Wöhler’s synthesis) is correct because Friedrich Wöhler's synthesis of urea from ammonium cyanate in 1828 disproved the vital force theory, which stated that organic compounds could only be produced by living organisms.

18 Easy

18 of 153

Understanding +4 | -1

What information is provided by reaction mechanism?

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Correct option: D

All of the above

Option D (All of the above) is correct because a reaction mechanism provides information about the bonds broken and formed, the reaction intermediates, and the relative rates of the discrete steps.

19 Easy

19 of 153

Remembering +4 | -1

Which of the substance is purified by sublimation?

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because benzoic acid, camphor, and naphthalene are all organic solids that can be purified by sublimation, which involves direct conversion from solid to gas phase.

20 Easy

20 of 153

Analyzing +4 | -1

The correct order of increasing acid strength of the compounds (A)

\mathrm{CH}_3 \mathrm{COOH},

(B)

\mathrm{MeOCH}_2 \mathrm{C O O H},

(C)

\mathrm{CF}_3 \mathrm{COOH},

(D)

\left(\mathrm{CH}_3\right)_2 \mathrm{CHCOOH}

View answer and explanation

Correct option: C

<

<

<

Option C (D < A < B < C) is correct because the acidity increases with the presence of electron-withdrawing groups. CF3 is the strongest electron-withdrawing group, followed by MeOCH2, then CH3, and (CH3)2CH is electron-donating, making it the least acidic.

21 Easy

21 of 153

Application +4 | -1

IUPAC name of the compound 

C{H_3} - \mathop {CH}\limits_{\mathop |\limits_{C{H_3}} } - OC{H_3}

is .................

View answer and explanation

Correct option: C

2 – methoxy propane

Option C (2 – methoxy propane) is correct because it accurately represents the IUPAC naming conventions for ethers with substituents.

22 Easy

22 of 153

Understanding +4 | -1

In hyper conjugation there is overlap between

View answer and explanation

Correct option: D

\sigma - and\,p - orbitals

Option D (

\sigma - and\,p - orbitals

) is correct because hyperconjugation involves the overlap of a sigma bond (usually C-H) with an adjacent p orbital.

23 Easy

23 of 153

Understanding +4 | -1

Racemic mixture is formed by mixing two

View answer and explanation

Correct option: D

enantiomers with chiral carbon

Option D (enantiomers with chiral carbon) is correct because a racemic mixture is formed by mixing equal amounts of two enantiomers, which are chiral compounds.

24 Easy

24 of 153

Understanding +4 | -1

When an organic compound is present in aqueous medium and is less soluble in any organic solvent, then it is separated by

View answer and explanation

Correct option: A

Continuous extraction

The correct answer is Continuous extraction because it is designed to efficiently extract a compound from an aqueous solution into an organic solvent, especially when the compound is only slightly soluble in the organic solvent.

25 Easy

25 of 153

Understanding +4 | -1

A mixture of two organic compounds

A

and

B

can be separated by
(B. P of

A = {80^0}C

, B. P of

B = {110^0}C

)

View answer and explanation

Correct option: B

Steam distillation

The correct answer is Steam distillation because it is suitable for separating immiscible liquids with relatively high boiling points.

26 Easy

26 of 153

Remembering +4 | -1

Which method is used to separate sugars?

View answer and explanation

Correct option: C

Chromatography

The correct answer is Chromatography because it is a technique used to separate mixtures based on their different affinities for a stationary and mobile phase, making it suitable for separating sugars.

27 Easy

27 of 153

Understanding +4 | -1

The family to which methoxyethene belongs, is :

View answer and explanation

Correct option: C

Unsaturated ether

Option C (Unsaturated ether) is correct because methoxyethene contains both an ether linkage (C-O-C) and a carbon-carbon double bond (unsaturation).

28 Easy

28 of 153

Understanding +4 | -1

Resonance effect involves

View answer and explanation

Correct option: D

all are correct

Option D (all are correct) is correct because resonance involves the delocalization of pi electrons, lone pairs, or negative charges along a conjugated system.

29 Easy

29 of 153

Remembering +4 | -1

A carbonium ion contains :

View answer and explanation

Correct option: A

A + vely charged carbon centre

Option A (A + vely charged carbon centre) is correct because a carbonium ion is defined as a positively charged carbon species.

30 Easy

30 of 153

Remembering +4 | -1

Electrophiles are :

View answer and explanation

Correct option: A

Electron loving species

Option B (Short lived) is correct because free radicals are highly reactive due to the presence of an unpaired electron, making them short-lived.

Revision notes and key takeaways

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Key Takeaways

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