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 SN1 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 + R-CN + KCl
To obtaine propanenitrile, R-Cl should be
chloroethane
1-chloropropane
chloromethane
2-chloropropane
Which of the following is not true for SN1 reaction?
3°-alkyl halides generally react through SN1 reaction
The rate of the reaction does not depend upon the molar concentration of the nucleophile
1°-alkyl halides generally react through SN1 reaction
It is favoured by polar solvents
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
An incorrect statement with respect to SN1 and SN2 mechanisms for alkyl halide is
A strong nucleophile in an aprotic solvent increases the rate or favours SN2 reaction.
Competing reaction for an SN2 reaction is rearrangement.
SN1 reactions can be catalysed by some Lewis acids.
A weak nucleophile and a protic solvent increases the rate or favours SN1 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
CH3CH(OH)C6H5
CH3CH(OH)C2H5
(CH3)2C(OH)C6H5
In Grignard reagent the carbon-magnesium bond is:
electrovalent
covalent
dative
hydrogen bonding