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What is the correct order of reactivity for the following compounds in an \(S_N 1\) reaction?
| 1. | II > I > III | 2. | III > II > I |
| 3. | I > II > III | 4. | I > III > II |
Subtopic: Â Chemical Properties |
From NCERT
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When an optically active alcohol is reacted with thionyl chloride then alkyl chloride is formed . In this reaction
1. 100% inversion of configuration takes place
2. 100% retention of configuration takes place
3. Racemic mixture is formed
4. Meso mixture is formed
Subtopic: Â Introduction and Physical Properties |
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The increasing order of the boiling points of the major products A, B and C of the following reactions will be :
| (a). |  |
| (b). |  |
| (c). |  |
1. C < A < B
2. B < C < A
3. A < B < C
4. A < C < B
Subtopic: Â Introduction and Physical Properties |
 80%
From NCERT
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The total number of monohalogenated organic products (excluded stereoisomer) in the following reaction is-
A (simplest optically active alkene) \(\xrightarrow[2. Cl_{2}/hv]{1. H_{2}/Ni}\) Products
1. 5
2. 4
3. 6
4. 8
A (simplest optically active alkene) \(\xrightarrow[2. Cl_{2}/hv]{1. H_{2}/Ni}\) Products
1. 5
2. 4
3. 6
4. 8
Subtopic: Â Chemical Properties |
 60%
From NCERT
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Given below are two statements:
| Assertion (A): | Vinyl halides do not undergo nucleophilic substitution easily. |
| Reason (R): | Even though the intermediate carbocation is stabilized by loosely held p-electrons, the cleavage is difficult because of strong bonding. |
Choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Chemical Properties |
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NEET 2026 - Target Batch - Vital
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When alcohol is reacted with SOCl2 in presence of pyridine then alkyl chloride is formed. The reaction follows the mechanism
1. SN1
2. SN2
3. SNi
4. SNi + SN2
1. SN1
2. SN2
3. SNi
4. SNi + SN2
Subtopic: Â Chemical Properties |
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Subtopic: Â Chemical Properties |
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Case Study
A halogen is more electronegative than carbon. Consequently, the two atoms do not share their bonding electrons equally, because a partial negative charge is formed on halogen and a partial positive charge on the carbon to which it is bonded. It is the polar-carbon halogen bond that causes alkyl halides to undergo substitution reactions.
There are two important mechanisms for the substitution reaction:
1. SN1: The carbon-halogen bond breaks heterolytically without any assistance from the nucleophile, forming a carbocation. The carbocation- an electrophile-then reacts with the nucleophile to form the substitution product
2. SN2: A nucleophile is attracted to the partially positively charged carbon (an electrophile).As the nucleophile approaches the carbon and forms a new bond, the carbon-halogen bond breaks heterolytically (the halogen takes both of the bonding electrons)
Based on the above, given the following reaction.
Compound 'A', in the above reaction, is
1.
2. \(CH_2 = CH -CH_2-OH\)
3. \(~~~~~~~~~~~~~OH \\ ~~~~~~~~~~~~~~~|\\ CH_2 = C -CH_3\)
4. \(~~~~~~~~~~~~~~O \\ ~~~~~~~~~~~~~~~||\\ CH_3 = C -CH_3\)
A halogen is more electronegative than carbon. Consequently, the two atoms do not share their bonding electrons equally, because a partial negative charge is formed on halogen and a partial positive charge on the carbon to which it is bonded. It is the polar-carbon halogen bond that causes alkyl halides to undergo substitution reactions.
There are two important mechanisms for the substitution reaction:
1. SN1: The carbon-halogen bond breaks heterolytically without any assistance from the nucleophile, forming a carbocation. The carbocation- an electrophile-then reacts with the nucleophile to form the substitution product
2. SN2: A nucleophile is attracted to the partially positively charged carbon (an electrophile).As the nucleophile approaches the carbon and forms a new bond, the carbon-halogen bond breaks heterolytically (the halogen takes both of the bonding electrons)
Based on the above, given the following reaction.
Compound 'A', in the above reaction, is
1.
2. \(CH_2 = CH -CH_2-OH\)
3. \(~~~~~~~~~~~~~OH \\ ~~~~~~~~~~~~~~~|\\ CH_2 = C -CH_3\)
4. \(~~~~~~~~~~~~~~O \\ ~~~~~~~~~~~~~~~||\\ CH_3 = C -CH_3\)
Subtopic: Â Mechanism of Reactions |
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When p-chlorotoluene is reacted with liquid \(KNH_2\) then the major product formed is
1. o-toluidine
2. m-toluidine
3. p-toluidine
4. Toluene
1. o-toluidine
2. m-toluidine
3. p-toluidine
4. Toluene
Subtopic: Â Chemical Properties |
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