Match List-I with List-II
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List-I |
List-II |
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(A) Ambident nucleophiles |
(I) Symmetrical object |
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(B) Plane polarized light |
(II) Saytzeff rule |
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(C) Superimposable mirror image |
(III) Cyanides and nitrites |
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(D) β-elimination reaction |
(IV) Nicol Prism |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
The list mixes terms from the chemistry of haloalkanes: nucleophiles, optical activity and elimination reactions.
(A) Ambident nucleophiles — This matches (III) Cyanides and nitrites. An ambident nucleophile has two different atoms that can donate electrons. The cyanide ion can attack through C (giving alkyl cyanides) or N (isocyanides); the nitrite ion through O (alkyl nitrites, R–O–N=O) or N (nitroalkanes, \( \ce{R-NO2} \)).
(B) Plane polarized light — This matches (IV) Nicol Prism. Ordinary light passed through a Nicol prism comes out vibrating in a single plane; this plane polarised light is used to test optical activity in a polarimeter.
(C) Superimposable mirror image — This matches (I) Symmetrical object. An object that is superimposable on its mirror image is achiral; such objects have symmetry, while chiral objects such as our hands do not.
(D) β-elimination reaction — This matches (II) Saytzeff rule. In dehydrohalogenation, the halogen and a hydrogen on the β-carbon are removed; when more than one alkene can form, the Saytzeff rule says the major product is the more substituted alkene, for example 2-bromobutane giving mainly but-2-ene.
\( \ce{CH3CH2CHBrCH3} \xrightarrow[\Delta]{\text{alc. }\ce{KOH}} \underset{\text{major}}{\ce{CH3CH=CHCH3}} + \underset{\text{minor}}{\ce{CH3CH2CH=CH2}} \)
Shortcut: (A)-(III) appears in Options (1) and (4); (D)-(II) then leaves only Option (1).