General
✓✗Ethanol on heating with conc. H2SO4 at 443 K gives
- ethanoic acid
- ethene
- ethanal
- diethyl ether
General
✓✗Phenoxide ion is a
- weaker base than ethoxide ion
- neutral species
- stronger base than hydroxide ion
- stronger base than ethoxide ion
General
✓✗The compound that is most difficult to protonate is
- CH3−O−H
- CH3−O−CH3
- C6H5−O−H (phenol)
- H−O−H
General
✓✗The cumene process for phenol is economical because
- phenol is formed in one step from benzene
- acetone, a useful by-product, is also formed
- no catalyst is needed
- it uses chlorobenzene
General
✓✗Which Grignard reaction gives butan-2-ol after hydrolysis?
- CH3MgBr + CH3COCH3
- CH3MgBr + HCHO
- CH3CH2MgBr + CH3CHO
- CH3CH2CH2MgBr + HCHO
General
✓✗Phenol and benzyl alcohol can be distinguished by
- Lucas reagent at room temperature (both react)
- aqueous NaOH (phenol dissolves)
- combustion
- sodium metal
General
✓✗Propene \( \xrightarrow{\;\text{(i) B}_2\text{H}_6\text{;\;(ii) H}_2\text{O}_2\text{/OH}^-\;} \) A \( \xrightarrow{\;\text{PCC}\;} \) B \( \xrightarrow{\;\text{(i) CH}_3\text{MgBr;\;(ii) H}_3\text{O}^+\;} \) C. C is
- butan-2-ol
- propan-2-ol
- 2-methylpropan-2-ol
- butan-1-ol
General
✓✗Alcohols react with sodium metal to give
- ether and hydrogen
- alkene and water
- sodium hydroxide and alkane
- sodium alkoxide and hydrogen
General
✓✗A ketone reacts with RMgX followed by hydrolysis to give
- a primary alcohol
- a tertiary alcohol
- an aldehyde
- a secondary alcohol
General
✓✗In the acid-catalysed dehydration of alcohols, the slowest (rate-determining) step is
- protonation of the alcohol
- formation of the carbocation by loss of water
- loss of H+ from the carbocation
- attack of a nucleophile
General
✓✗Statement I: In the cleavage of methyl isopropyl ether by HI, methyl iodide and propan-2-ol are formed.
Statement II: When both groups are primary or secondary, I− attacks the less hindered carbon by SN2.
Statement II: When both groups are primary or secondary, I− attacks the less hindered carbon by SN2.
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
General
✓✗The number of aromatic isomers of C7H8O that give a violet colour with neutral FeCl3 is
- 2
- 5
- 4
- 3
General
✓✗The solubility of alcohols in water
- increases as the size of the alkyl group increases
- decreases as the size of the alkyl group increases
- is independent of the alkyl group
- is zero for all alcohols
General
✓✗Which alcohol gives a ketone with the same number of carbon atoms on oxidation?
- 2-Methylpropan-2-ol
- 2-Methylpropan-1-ol
- Butan-2-ol
- Butan-1-ol
General
✓✗The correct order of boiling points is
- methoxyethane > propan-1-ol > butane
- propan-1-ol > butane > methoxyethane
- propan-1-ol > methoxyethane > butane
- butane > methoxyethane > propan-1-ol