Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): [IMAGE 50] undergoes reaction faster than [IMAGE 51].
Reason (R): Iodine is a better leaving group because of its large size.
In the light of the above statements, choose the correct answer from the options given below: [2025]
A is true but R is false.
A is false but R is true.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
How many products (including stereoisomers) are expected from monochlorination of the following compound? [2025]
[IMAGE 52]
5
6
2
3
(2)
[IMAGE 53]
Thus, total six isomers are possible.
The major product C in the below mentioned reaction is [2024]
propan-1-ol
propan-2-ol
propane
propyne
(2)
[IMAGE 54]
The compound that will undergo reaction with the fastest rate is [2024]
[IMAGE 55]
[IMAGE 56]
[IMAGE 57]
[IMAGE 58]
(4)
Rate of reaction increases as the stability of carbocation formed, increases.
[IMAGE 59] (Most stable due to 2° carbocation with resonance stabilisation.)
Major products A and B formed in the following reaction sequence are [2024]
[IMAGE 60]
[IMAGE 61]
[IMAGE 62]
[IMAGE 63]
[IMAGE 64]
(1)
[IMAGE 65]
Identify ‘X’ in the following reaction. [2023]
[IMAGE 66]
[IMAGE 67]
[IMAGE 68]
[IMAGE 69]
[IMAGE 70]
(1)
[IMAGE 71]
The correct order for the rate of -dehydrohalogenation for the following compounds is _______. [2023]
[IMAGE 72]
(i) < (ii) < (iii)
(ii) < (i) < (iii)
(iii) < (ii) < (i)
(ii) < (iii) < (i)
(4)
[IMAGE 73]
Rate of dehydrohalogenation of the alkyl halides depends on the stability of the alkene formed. Alkene formed in case (i) is most stable (conjugated diene), followed by (iii), which is a more substituted alkene. The alkene formed in case (ii) is least stable as it is least substituted.
Rate of dehydrohalogenation : (ii) < (iii) < (i)
Which amongst the following reactions of alkyl halides produces isonitrile as a major product?
A)
B)
C)
D)
Choose the most appropriate answer from the options given below: [2023]
(D) only
(C) and (D) only
(B) only
(A) and (B) only
(3)
In (A), (C) and (D), nitrile is formed as the major product.
The incorrect statement regarding chirality is [2022]
reaction yields 1 : 1 mixture of both enantiomers
the product obtained by reaction of haloalkane having chirality at the reactive site shows inversion of configuration
enantiomers are superimposable mirror images of each other
a racemic mixture shows zero optical rotation
(3)
Enantiomers are non-superimposable mirror images of each other. Enantiomers possess identical physical properties namely, melting point, boiling point, refractive index, etc. They only differ with respect to the rotation of plane polarised light. If one of the enantiomer is dextrorotatory, then other will be laevorotatory.
The major product formed in dehydrohalogenation reaction of 2-bromopentane is pent-2-ene. This product formation is based on? [2021]
Huckel’s Rule
Saytzeff’s Rule
Hund’s Rule
Hofmann Rule
(2)
It is an example of -elimination, as the major product is 2-pentene (more substituted) not 1-pentene, hence it follows Saytzeff’s rule.
[IMAGE 74]
