questions Flashcards
1
Q
why is it better to produce primary amines from nitriles than haogenalakes
A
- further reactions with halogenoalkanes
- with nitriles only one product is formed
2
Q
C4H7NO reacts with H2 in a nickel catalyst to form compound M. How is the compound different from L
A
- fingerprint region is different
- peak 3300 appears
3
Q
state why Si(CH3)4, CCl4, CDCl3 are used in H NMR spectroscopy
A
- TMS as a standard
- inert
- CCL4, CDCl3 - have no H atoms
- CCl4 is on polar
- TMS gives on signal
- CDCL3, CCl4 is a solvent
4
Q
compare the stability of benzene with the hypothetical cyclohexa-1,3,5-triene molecule
A
- Each C has three (covalent) bonds
- Spare electrons overlap
- delocalisation
- 6 carbon ring
- C–C bonds equal in length
- Expected ∆Ho hydrogenation of cyclohexatriene = –360 kJ mol–1
- Benzene is more stable
