General
✓✗Aniline \( \xrightarrow{\;\text{NaNO}_2\text{/HCl, 273 K}\;} \) A \( \xrightarrow{\;\text{H}_2\text{O, warm}\;} \) B. B is
- chlorobenzene
- benzene
- nitrobenzene
- phenol
General
✓✗Aniline \( \xrightarrow{\;\text{Br}_2\text{ water}\;} \) A \( \xrightarrow{\;\text{NaNO}_2\text{/HCl, 273 K}\;} \) B \( \xrightarrow{\;\text{H}_3\text{PO}_2\;} \) C. C is
- bromobenzene
- p-bromoaniline
- 1,3,5-tribromobenzene
- 2,4,6-tribromophenol
General
✓✗Amines have lower boiling points than alcohols of comparable molar mass because
- the N−H bond is less polar than the O−H bond, so hydrogen bonding is weaker
- amines are ionic
- amines cannot form any hydrogen bonds
- amines have higher molar masses
General
✓✗Which reaction of benzenediazonium chloride does NOT involve loss of nitrogen gas?
- Reaction with KI
- Reaction with CuCN
- Coupling with phenol
- Warming with water
General
✓✗Azo dyes contain the group
- −N≡N+
- −NH−NH−
- −C≡N
- −N=N−
General
✓✗The IUPAC name of H2N−CH2CH2−NH2 is
- ethanamine-2-amine
- ethane-1,2-diamine
- 1,2-diaminoethene
- ethylenediamide
General
✓✗Diazonium salts are important in synthesis because they allow the introduction of
- only nitro groups
- F, Cl, Br, I, CN, OH, H and NO2 groups that are difficult to introduce directly
- only alkyl groups
- only hydrogen
General
✓✗Benzenediazonium chloride \( \xrightarrow{\;\text{KI}\;} \) gives
- benzene
- iodobenzene
- phenol
- p-iodoaniline
General
✓✗Chlorobenzene can be prepared from aniline by
- HCl alone
- SOCl2
- diazotisation followed by CuCl/HCl (Sandmeyer)
- Cl2/FeCl3 directly on aniline
General
✓✗Which sequence converts ethanoic acid into methanamine?
- LiAlH4; then NH3
- NaOH; then soda-lime
- SOCl2; then H2/Pd−BaSO4
- NH3, heat (amide); then Br2/NaOH
General
✓✗Assertion: The coupling reaction of phenol with benzenediazonium chloride is carried out in alkaline medium.
Reason: The phenoxide ion is more strongly activated than phenol.
Reason: The phenoxide ion is more strongly activated than phenol.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗Benzonitrile \( \xrightarrow{\;\text{(i) LiAlH}_4\text{, H}_2\text{O;\;(ii) NaNO}_2\text{ + HCl;\;(iii) H}_2\text{O}\;} \) product. The product is
- benzamide
- benzyldiazonium chloride
- benzyl chloride
- benzyl alcohol
General
✓✗Which of the following reactions will NOT give a primary amine as the product?
- CH3NC \( \xrightarrow{\;\text{(i) LiAlH}_4\text{;\;(ii) H}_3\text{O}^+\;} \)
- CH3CN \( \xrightarrow{\;\text{(i) LiAlH}_4\text{;\;(ii) H}_3\text{O}^+\;} \)
- CH3CONH2 \( \xrightarrow{\;\text{Br}_2\text{/KOH}\;} \)
- CH3CONH2 \( \xrightarrow{\;\text{(i) LiAlH}_4\text{;\;(ii) H}_3\text{O}^+\;} \)
General
✓✗The reagents used in Hofmann bromamide degradation are
- NaNO2 and HCl
- CHCl3 and KOH
- Br2 and red P
- Br2 and aqueous (or ethanolic) NaOH
General
✓✗Assertion: Benzenediazonium chloride does not react with nitrobenzene.
Reason: The diazonium ion is a weak electrophile and nitrobenzene is a deactivated ring.
Reason: The diazonium ion is a weak electrophile and nitrobenzene is a deactivated ring.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false