Decomposition of benzene diazonium chloride by using Cu₂Cl₂/ HCl to form chlorobenzene is

• Raschig's reaction

• Sandmeyer's reaction

• Kolbe's reaction

• Cannizaro's reaction

In electrophilic aromatic substitution reaction, the nitro group is meta directing because it

• decreases electron density at ortho and para positions

• decreases electron density at meta position

• increases electron density at meta position

• increases electron density at ortho and para positions

Reaction of methyl bromide with aqueous sodium hydroxide involves

• racemisation

• S_N 1 mechanism

• retention of configuration

• S_N 2 mechanism

604.

Identify B and D in the following sequence of reactions

• methanol and bromoethane

• ethyl hydrogen sulphate and alcoholic KOH

• ethyl hydrogen sulphate and aqueous KOH

• ethanol and alcoholic KOH

Ethyl benzene cannot be prepared by

• Wurtz reaction

• Wurtz-Fittig reaction

• Friedel-Craft's reaction

• Clemmensen reduction

Which one of the following is not true for the hydrolysis of t-butyl bromide with aqueous NaOH? 

• Reaction occurs through the S_N1 mechanism

• The intermediate formed is a carbocation

• Rate of the reaction doubles when the concentration of alkali is doubled

• Rate of the reaction doubles when the concentration of t-butyl bromide is doubled 

Following is the substitution reaction in which -CN replaces -Cl.

R-Cl + $\underset{\left(\mathrm{alcoholic}\right)}{\mathrm{KCN}} \underset{∆}{\to }$ R-CN + KCl

To obtaine propanenitrile, R-Cl should be

• chloroethane

• 1-chloropropane

• chloromethane

• 2-chloropropane

Which of the following is not true for S_N1 reaction?

• 3°-alkyl halides generally react through S_N1 reaction

• The rate of the reaction does not depend upon the molar concentration of the nucleophile

• 1°-alkyl halides generally react through S_N1 reaction

• It is favoured by polar solvents

Oil of winter green is

• a carboxylic acid

• an alcohol

• a ketone

• an ester

Match the reactant in Column I with the reaction in Column II.

Column I	Column II
A. Acetic acid	i. Stephen
B. Sodium phenate	ii. Friedel Crafts
C. Methyl cyanide	iii. HVZ
D. Toulene	iv. Kolbe's

• A - iii; B - i; C - iv; D - ii

• A - iv; B - ii; C - iii; D - i

• A - ii; B - iii; C - i; D - iv

• A - iii; B - iv; C - i; D - ii