611.

An incorrect statement with respect to S_N1 and S_N2 mechanisms for alkyl halide is

• A strong nucleophile in an aprotic solvent increases the rate or favours S_N2 reaction.

• Competing reaction for an S_N2 reaction is rearrangement.

• S_N1 reactions can be catalysed by some Lewis acids.

• A weak nucleophile and a protic solvent increases the rate or favours S_N1 reaction.

The hydrolysis of optically active 2-bromobutane with aqueous NaOH result in the formation of

• (+) butan -2-ol

• (-) butan-2-ol

• (±) butan-1-ol

• (±) butan-2-ol

Predict the product 'C' in the following series of reactions:

CH₃-COOH $\stackrel{{\mathrm{PCl}}_5}{\to } \mathrm{A} \underset{\mathrm{Anhy}. {\mathrm{AlCl}}_3}{\overset{{\mathrm{C}}_6{\mathrm{H}}_6}{\to }} \mathrm{B} \stackrel{{\mathrm{CH}}_3\mathrm{MgBr}}{\to } \mathrm{C}$

• 

• CH₃CH(OH)C₆H₅

• CH₃CH(OH)C₂H₅

• (CH₃)₂C(OH)C₆H₅

In Grignard reagent the carbon-magnesium bond is:

• electrovalent

• covalent

• dative

• hydrogen bonding

In the reaction,

CH₃CH₂C ≡ CH $\underset{\left(\mathrm{ii}\right) {\mathrm{H}}_2\mathrm{O}}{\overset{\left(\mathrm{i}\right) {\mathrm{O}}_3}{\to }}$ Products

Products will be:

• CH₃COCH₃

• CH₃COCH₂OH

• CH₃COOH + HCOOH

• CH₃CHO + HCHO

Ethyl alcohol can be prepared from Grignard reagent by the reaction of :

• HCHO

• R₂CO

• RCN

• RCOCl

The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is

• gammexane

• DDT

• freon

• hexachloroethane

Ethyl alcohol is used as a preservative for chloroform because it :

• prevent aerial oxidation of chloroform

• prevents decomposition of chloroform

• decomposes phosgene to CO and Cl₂

• removes phosgene by converting it to ethyl carbonate

Protic solvent is

• diethyl ether

• n-hexane

• acetone

• ethanol

Mustrad gas is

• oil gas

• poisonous gas

• fuel gas

• life gas