Which of the following compounds is expected to show a sharp singlet for one of its protons at δ ≥ 8 ppm in 1H NMR spectrum, given that this signal remains unaffected on shaking the solution thoroughly with D2O?
A. CH3CO2H
B. CH3CONHC6H5
C. n-C6H13C ≡ CH
D. n-C6H13CHO
Answer: Option B
A. CH3C$${\text{O}}_2^ - $$ > CH3O- > C6H5O- > N$${\text{O}}_3^ - $$
B. CH3O- > N$${\text{O}}_3^ - $$ > C6H5O- > CH3C$${\text{O}}_2^ - $$
C. CH3O- > C6H5O- > CH3C$${\text{O}}_2^ - $$ > N$${\text{O}}_3^ - $$
D. C6H5O- > CH3O- > N$${\text{O}}_3^ - $$ > CH3C$${\text{O}}_2^ - $$
The most appropriate sequence of the reactions for carrying out the following conversion
is
A. (i) peracid, (ii) H+, (iii) Zn/dil.HCl
B. (i) Alkaline KMnO4, (ii) NalO4, (iii) N2H4/KOH
C. (i) Alkaline KMnO4, (ii) H+, (iii) Zn/dil.HCl
D. (i) O3/Me2S, (ii) NaOEt, (iii) N2H4/KOH
A. CH3CO2H
B. CH3CONHC6H5
C. n-C6H13C ≡ CH
D. n-C6H13CHO
Conversion of Ph-NH2 into Ph-CN can be accomplished by
A. reaction with sodium cyanide in the presence of nickel catalyst
B. reaction with chloroform and sodium hydroxide
C. diazotisation followed by reaction with CuCN
D. reaction with ethyl formate followed by thermolysis
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