8.1)The enol content of CH3COCH2CO2Et in hexane is 46% and that in water is 0.4%. The reason for the above observation is as follows: (A) Intermolecular hydrogen bonding is stabilized by hexane. (B) Intramolecular hydrogen bonding is stabilized by water. (C) Intramolecular hydrogen bonding is destabilized by water. (D) CH3COCH2CO2Et dissolves in hexane completely.
8.1)The enol content of CH3COCH2CO2Et in hexane is 46% and that in water is 0.4%. The
reason for the above observation is as follows:
(A) Intermolecular hydrogen bonding is stabilized by hexane.
(B) Intramolecular hydrogen bonding is stabilized by water.
(C) Intramolecular hydrogen bonding is destabilized by water.
(D) CH3COCH2CO2Et dissolves in hexane completely.
2)The molecular formula of glucose is C6H12O6. The chemical composition of glucose is
(A) 39.99 % C, 6.71 % H, 53.27 % O (B) 40.99 % C, 6.71 % H, 53.27 % O
(C) 39.99 % C, 7.71 % H, 54.27 % O (D) 29.99 % C, 7.71 % H, 53.00 % O
3)20 mL of 0.2 M hydrochloric acid is added to 5 mL of 0.1 M sodium carbonate. The
resultant solution is then titrated against 0.2 M sodium hydroxide. What will be the titre
value?
(A) 15 mL
(B) 10 mL
(C) 5 mL
(D) 20 mL
4) High thermal stabilities of
(A) non-availability of d-orbital on carbon.
(B) formation of an ionic bond between CO and metal.
(C) interaction of filled metal d-orbital with the empty antibonding π* orbital of CO.
(D) covalent bonds of oxygen in CO with antibonding π* orbital of metals.
5) The most appropriate reagent required for the Michael addition to cyclohex-2-enone is
(A) MeLi
(B) MeMgBr
(C) Me2CuLi
(D) MeMgCl
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