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1.

Which alkyl halide from the following would you expect to react more rapidly by `S_(N)2` mechanism ?A. `CH_(3)underset(CH_(3))underset(|)CHCH_(2)CH_(2)Br`B. `CH_(3)CH_(2)underset(CH_(3))underset(|)CHCH_(2)Br`C. `CH_(3)CH_(2)overset(CH_(3))overset(|)underset(CH_(3))underset(|)C CH_(2)Br`D. `CH_(3)CH_(2)underset(CH_(3))underset(|)CHBr`

Answer» Correct Answer - A
`CH_(3)underset(CH_(3))underset(|)CHCH_(2)CH_(2)Br`
Out of the given compounds, three are primary halides The presence of methyl group closer to halide group increases the steric hindrance and decreases rate of the reaction. Hence, compound (a) reacts rapidly.
Discussion
2.

The treatment of `CH_(3)MgX` with `CH_(3)-C-=C-H` producesA. `CH_(3)-CH=CH_(2)`B. `CH_(3)C-=C-CH_(2)`C. `CH_(3)-overset(H)overset(|)C=overset(H)overset(|)C-CH_(2)`D. `CH_(4)`

Answer» Correct Answer - D
`CH_(3)MgX+CH_(3)C-=CHrarrCH_(4)+CH_(3)C-=CMgX`
Discussion
3.

Consider the following reaction, `(CH_(3))_(3)C-Cl+OHrarr(CH_(3))_(3)C-OH+Cl^(-)` The true statement about the above process isA. the rate becomes four times of the halide becomes twiceB. the rate does not change by reducing `[OH^(-)]` to halfC. the rate does not change by doubling [halide]D. the rate becomes twice on doubling the `[OH^(-)]`

Answer» Correct Answer - B
`S_(N)1` reaction depends only upon concentration of substrate.
Discussion
4.

In alkaline hydrolysis of a tertiary halide by aqueous alkali, if concentration of alkali is doubled, then the reaction rateA. will be boubledB. will be halvedC. will remain constantD. Cannot say anything

Answer» Correct Answer - C
Reaction of t-alkyl halides with aquious alkali gives `S_(N)1` reaction is not beaed on the concentration of nucleophile (alkali). Hence, reaction rate remains constant.
Discussion
5.

`20%` aqueous solution of sodium, chloride containing ethy alcohol or electrolyasis givesA. `C_(2)H_(5)Cl`B. `CH_(3)CHO`C. `CHCl_(3)`D. `C Cl_(3)CHO`

Answer» Correct Answer - C
Electrolysis of aqueous NaCl sloution gives NaOH and `Cl_(2)`. These reactants on reaction give chloroform.
Discussion
6.

Which of the following reactions come within the framework of elimination?A. `(CH_(3))_(2)CHCl+SH^(o+)`B. `(CH_(3)_(3)C-Br+"ethanolic KCN"`C. `CH_(3)CH_(2)CH_(2)Cl+l^(-)`D. `(CH_(3))_(2)CHBr+aq.KOH`

Answer» Correct Answer - B
`(CH_(3))_(3)C-Br` undergoes dehydrobromination by ethanolic KCN and produces lsobutylene.
Discussion
7.

Which does not give methyl bromide?A. `CH_(3)OH+HBr`B. `CH_(3)OH+Br_(2)`C. `CH_(3)OH+PBr_(3)`D. `CH_(3)COOAg+Br_(2)`

Answer» Correct Answer - B
`CH_(3)OH+HBrrarrCH_(3)Br+H_(2)O`
`CH_(3)OH+PBr_(3)rarrCH_(3)Br+H_(3)PO_(3)`
`CH_(3)COOAg+Br_(2)rarrCH_(3)Br+CO_(2)+AgBr`
Discussion
8.

Choose the incorrect statement.A. An `S_(N)1` reaction proceeds with inversion of configurationB. An `S_(N)2` reaction proceeds with stereochemical inversionC. An `S_(N)2` reaction follows second order kineticsD. The reaction of tert-butyl bromide with `OH^(-)` follows first order kinetics

Answer» Correct Answer - A
`S_(N)1` reactions are accompanied by racemisation.
Discussion