Estramethylsilane) is added to the sample beeause y shielded b-Protons are less

Question

Estramethylsilane) is added to the sample beeause y shielded b-Protons are less shielded d-Non of the abeve 20-The sumber of signals shows e-how many number of protons 21.Electronegative substituents a- shows the number of protons on adjacent atoms b-The shiñhs of these protonssre present are present d-how many different kinds of pretons a a-Increase shielding b not effect e-non of the above 22-It is possible to form a Grignard reagent from a-an organolithi b-an organolithi c-an organolithi d-anorganpltinum d- Decrease shielding um compound and one equivalent of magnesium um compound and one equivalent of calcium halide num compound and one equivalent of sodium halide. halide compound and one equivalent of brelium halide 23-Which of the following "pietures" b)R'M (o R Npest rprsents the polarity of organometalle compounds 7 r (a) R M 24-addition of a Grignard reagent to formaldehyde followed by H,O gives le in the 1H NMR spectrum provides information about the number c.splitting d.chemical shift a- 1 alcohol b-2ndry alcohol e-tertiary a h featu of types of different proton a.number of signals b.integral c s in a compound? ny sets of equivalent protons are there in 3-methylhexane? d.7 27-Ho NMR spectra? a) five 1H signals and six 13C signals w many signals does the aldehyde (CH3)3CCH2CHO have in 1H NMR and 13C -b) three H signals and four 13C signals c) five 1H signals and fo five 1H signals and four 13C signals d) three 1H signals and six 13C signals a-1 alcoholb-2ndry alcohol tertiary alcohol d-Aldhyde 29-Gilman reagent is a-Lithiumdiorganocopper c- Methylmagnesiumiodide 28-addition of a Grignard reagent to ketone followed by H,O' gives b-Lithium diorganomagnesium d- Methylmagnesiumbromide 30-Which of hydrogens a-d in the following molecule gives a triplet signal in a normal H NMR spectrum? CH3-c-CH2CH(OCH3)2 hydrogen a b) hydrogen b c) hydrogen c d) hydrogen

Explanation / Answer

20) a) protons of TMS are highly shielded

21) d) how many different kind of protons are present

22)a) an organolithium compound and one equivalent of magnesium halide

23)c) R- M+

24) b) secondary alcohol

25) b) integral

26) d) 7

27)b) three 1H signal and four 13C signal

28) c) tertiary alcohol

29)a) lithium diorgano copper

30)c) hydrogen c

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