Match List-I with List-II
|
List-I |
List-II |
|
(A) $S_N1$ Reaction |
(I) vic-dibromides |
|
(B) Bromination of alkenes |
(II) gem-dihalides |
|
(C) Alkylidene halides |
(III) racemisation |
|
(D) Elimination of HX from alkylhalide |
(IV) Saytzeff rule |
Choose the correct answer from the options given below.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A)-(III), (B)-(I), (C)-(II), (D)-(IV)
|
List-I |
List-II |
|
(A) $S_N1$ Reaction |
(III) racemisation |
|
(B) Bromination of alkenes |
(I) vic-dibromides |
|
(C) Alkylidene halides |
(II) gem-dihalides |
|
(D) Elimination of HX from alkylhalide |
(IV) Saytzeff rule |
(A) $S_N1$ Reaction: This reaction proceeds via a planar carbocation intermediate. Nucleophilic attack can occur from either side of this plane with equal probability, leading to the formation of a mixture of both enantiomers. This process is known as racemisation.
- Match: (III) racemisation
(B) Bromination of alkenes: When an alkene reacts with $Br_2$ (usually in $CCl_4$), the bromine atoms add across the double bond to adjacent carbon atoms. This produces a vicinal dibromide (or vic-dibromide).
- Match: (I) vic-dibromides
(C) Alkylidene halides: In organic nomenclature, alkylidene halides are compounds where two halogen atoms are attached to the same carbon atom. These are also known as geminal dihalides (or gem-dihalides).
- Match: (II) gem-dihalides
(D) Elimination of HX from alkyl halide: Dehydrohalogenation (an E1 or E2 reaction) often follows the Saytzeff (Zaitsev) rule,which states that in any dehydrohalogenation reaction, the select product is the alkene having a large number of the alkyl groups attached to the doubly bonded carbon atoms in the reaction
- Match: (IV) Saytzeff rule