Compound Y, C7H8O is insoluble in water, dil HCI and aqueous NaHCO3. It dissolves in dilute NaOH. When Y is treated with bromine water it is converted rapidly into a compound of formula C7H5OBr3. The structure of Y is:
1. | 2. | ||
3. | 4. |
Compounds I and II can be distinguished by using reagent:
(I) | 4–Amino–2–methlbut–3–en–2–ol |
(II) | 4–Amino–2,2–dimethylbut–3–yn–1–ol |
1. NaNO2/HCl
2. Br2/H2O
3. HCl/ZnCl2 (anhydrous)
4. Cu2Cl2 + NH4OH
The correct order of dehydration of compounds (i), (ii) and (iii) by conc. H2SO4 is:
(i) | |
(ii) | |
(iii) |
1. (i) > (iii) > (ii)
2. (i) > (ii) > (iii)
3. (ii) > (i) > (iii)
4. (ii) > (iii) > (i)
In each of the following groups, which is the strongest (best) nucleophile ?
(I)(1)H3C-O- (2) (3)H3C-S- in CH3OH
(II)(1)OH- (2) H2O (3) in DMF
(III) (1) (2) (3) CH3O- in DMSO
(a) I,3; II,3; III,2 (b) I,2; II,1; III,3
(c) I,1; II,2; III,1 (d) I,3; II,1; III,3
(A) on heating isomerizes to (B). What is the structure of (B) ?
Which of the following statements is true?
(1) CH3CH2S- is both a stronger base and more nucleophilic than CH3CH2O-
(2) CH3CH2S- is a stronger base but is less nucleophilic than CH3CH2O-
(3) CH3CH2S- is a weaker base but is more nucleophilic than CH3CH2O-
(4) CH3CH2S- is both a weaker base and less nucleophilic than CH3CH2O-
What sequence of reagents is required to accomplish the following transformation?
1. (1) NBS, ROOR (2) CH3CH2O- (3)2HBr (4) NH-2 (5) disiamylborane (6) H2O2,OH-
2. (1) Cl2hv (2) OH-, heat; (3) 2HCl (4) OH-,heat (5) HgSO4,H2SO4
3. (1) NBs,ROOR; OH-,DMSO
4. (1) Br2,hv (2) t-butoxide (3) BH3,THF (4) H2O2,OH-
Ether cannot be produced as a major product by the reaction of-
1. | CH3CH2Cl + Ag2O(dry) → |
2. | (CH3)3CCl + CH3CH2O-Na+ → |
3. | |
4. |