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51.

On treatment with chlorine in presence of sunlight toluene gives the product .A. o-chloro toueneB. 2,5-dichloro tolueneC. p-chloro touleneD. Benzyl chloride

Answer» Correct Answer - D
Discussion
52.

A solution of (-l)- chloro -1 phenyletane in toluene recemises slowly in the presence of a small amunt of `SbCI_(5)` due to the formation of .A. carbonionB. carbeneC. carbocationsD. free radical

Answer» Correct Answer - C
Discussion
53.

Bromination of cyclohexene under conditions gives below yields: A. B. C. D.

Answer» Correct Answer - D
Discussion
54.

Toluene, when treated with `Br_(2)Fe`, gives o and p-bromotoluene, because the `CH_(3)` group-A. is ortho and para directingB. is meta directingC. deactivates the ring by hyperconjugationD. deactivates the ring

Answer» Correct Answer - A
Discussion
55.

Chlorination of toluene in the presence of light and heat followed by treatment with aqueous NaOH givesA. o-cresolB. p-cresolC. 2,4 dihydroxytolueneD. Benzoic acid

Answer» Correct Answer - D
Discussion
56.

Bencyl chloride `(C_(6)H_(5)CH_(2)CI)` can be prepared from toluene by chlorination withA. `SO_(2)CI_(2)`B. `SOCI_(2)`C. `PCI_(5)`D. `NaOCI_(2)`

Answer» Correct Answer - A
Discussion
57.

Statement-I: Free radical chlorination of n-butane gives `72%` of 2-chlorobutane and `28%` of 1-chlorobutane though it has six primary and four secondary hydrogens. Because Statement-II: A secondary hydrogen is abstracted more easily than the primary hydrogen.A. Statement-I is True, Statement-II is True, Statement-II is a correct explanation for Statement-IB. Statement-I is True, Statement-II is True, Statement-II is NOT a correct explanation for Statement-IC. Statement-I is True, Statement-II is False.D. Statement-I is False, Statement-II is True.

Answer» Correct Answer - A
Discussion
58.

Statement-I: Optically active 2-idoibutane on treatment with `NaI` in acetone undergoes racemisation. Because Statement-II: Repeated Walden inversions on the reactant and its product evantually gives a racemic mixure.A. Statement-I is True, Statement-II is True, Statement-II is a correct explanation for Statement-IB. Statement-I is True, Statement-II is True, Statement-II is NOT a correct explanation for Statement-IC. Statement-I is True, Statement-II is False.D. Statement-I is False, Statement-II is True.

Answer» Correct Answer - A
Discussion
59.

Grignard reagent is obtained when magnesium is treated withA. Alkyl halide in presence of alcoholB. Alkyl halide in presence of phenolC. Alkyl halide in presence of dry etherD. Alkyl halide in presence of alcoholated ether

Answer» Correct Answer - C
Discussion
60.

The reagent(s) for the following conversion is/are:A. alcoholic `KOH`B. Alcoholic `KOH` followed by `NaNH_(2)`C. aqueous `KOH` followed by `NaNH_(2)`D. `Zn//CH_(3)OH`

Answer» Correct Answer - B
Discussion
61.

Grignard reagent can be prepared byA. `CH_(3)-CH_(2)-CI +Mg overset("dry")underset("ether")rarr`B. `CH_(3)-underset(CI)underset(|)(CH)-underset(OH)underset(|)(CH_(2)) +Mg overset("dry")underset("ether")rarr`C. `CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C)-OH +Mg overset("dry")underset("ether")rarr`D. All of them

Answer» Correct Answer - A
Discussion
62.

For the reaction A. `CH_(3)-CH=CH-CH_(3)` predominatesB. `CH_(2)=CH-CH_(2)-CH_(3)` predominatesC. Both are formed in equal amountsD. The product ratio depends on the halogen

Answer» Correct Answer - D
Discussion
63.

Most stable carbocation formed from `(CH_(3))_(3)C-Br,(C_(6)H_(5))_(3)CBr,(C_(6)H_(5))_(2)CHBr` and `C_(6)H_(5)CH_(2)Br` would beA. `C_(6)H_(5)overset(o+)(CH_(2))`B. `(CH_(3))_(3)overset(o+)(C)`C. `(C_(6)H_(5))_(3)overset(o+)(C)`D. `(C_(6)H_(5))_(2)overset(o+)(CH)`

Answer» Correct Answer - C
Discussion