Chemistry-
General
Easy
Question
The process of converting hydrated alumina into anhydrous alumina is called
- roasting
- calcination
- smelting
- dressing
The correct answer is: calcination
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The material used in semiconductors
The material used in semiconductors
Chemistry-General
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The D, L system of relative configuration is not 100% correct, and hence R, S system was adopted as a defect proof, absolute configuration. The R, S system involves the following steps:
Step I: The four atoms or groups attached to the chiral carbon atom are assigned a sequence of priorities according to sequence rules.
Step II: The arrangement of these four atoms is observed by drawing a curved arrow from the atom with the highest priority (1) to the atom with next highest (2) and if the direction of this arrow is clockwise it indicates R configuration, while the anticlockwise direction from group (1) to group (2) indicates S configuration. However, this convention is true only when the atom with the lowest priority (4) is present on the vertical bond, in case of Fischer projection. In case, the atom (4) lies on the horizontal bond opposite configuration is assigned.
Now observe the monochlorination of 2-chlorobutane.
Priority order of some groups:
Cl > CH2CH3 > CH3 > H; CH2Cl > CH2CH3, CH2CH2Cl > CH3
Which of the above structures can exit as enantiomers?
The D, L system of relative configuration is not 100% correct, and hence R, S system was adopted as a defect proof, absolute configuration. The R, S system involves the following steps:
Step I: The four atoms or groups attached to the chiral carbon atom are assigned a sequence of priorities according to sequence rules.
Step II: The arrangement of these four atoms is observed by drawing a curved arrow from the atom with the highest priority (1) to the atom with next highest (2) and if the direction of this arrow is clockwise it indicates R configuration, while the anticlockwise direction from group (1) to group (2) indicates S configuration. However, this convention is true only when the atom with the lowest priority (4) is present on the vertical bond, in case of Fischer projection. In case, the atom (4) lies on the horizontal bond opposite configuration is assigned.
Now observe the monochlorination of 2-chlorobutane.
Priority order of some groups:
Cl > CH2CH3 > CH3 > H; CH2Cl > CH2CH3, CH2CH2Cl > CH3
Which of the above structures can exit as enantiomers?
Chemistry-General
Chemistry-
(A) The hydrolysis of methyl acetate by dil HCI is a pseudo first order reaction.
(R) HCI acts as a catalyst for the hydrolysis.
(A) The hydrolysis of methyl acetate by dil HCI is a pseudo first order reaction.
(R) HCI acts as a catalyst for the hydrolysis.
Chemistry-General
Chemistry-
(A) Positive catalysts increase the rate of reaction.
(R) Catalysts decrease the value of 
(A) Positive catalysts increase the rate of reaction.
(R) Catalysts decrease the value of
Chemistry-General
Chemistry-
The rate constant of a reaction does not depend upon:
The rate constant of a reaction does not depend upon:
Chemistry-General
Chemistry-
A plot of log (a - x) against time' t' is a straight line. This indicates that the reaction is of:
A plot of log (a - x) against time' t' is a straight line. This indicates that the reaction is of:
Chemistry-General
Chemistry-
Cellulose on hydrolysis yields
Cellulose on hydrolysis yields
Chemistry-General
Chemistry-
Teflon is an example of:
Teflon is an example of:
Chemistry-General
Chemistry-
Two Ruff degradation of an aldohexose gives an
Two Ruff degradation of an aldohexose gives an
Chemistry-General
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Glucose reacts with acetic anhydride to form:
Glucose reacts with acetic anhydride to form:
Chemistry-General
Chemistry-
Which of the following compound is optically active?
Which of the following compound is optically active?
Chemistry-General
Chemistry-
Sulfonation of benzene differs from most other electrophilic substitution reactions in that the reaction.
Sulfonation of benzene differs from most other electrophilic substitution reactions in that the reaction.
Chemistry-General
Chemistry-
The appropriate reagent for the following transformation.
The appropriate reagent for the following transformation.
Chemistry-General
Chemistry-
Hydrogenation of the above compound in the presence of poisoned palladium catalyst gives
Hydrogenation of the above compound in the presence of poisoned palladium catalyst gives
Chemistry-General
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The products obtained via oximercuration (HgSO4 + H2SO4) of 1-butyne would be
The products obtained via oximercuration (HgSO4 + H2SO4) of 1-butyne would be
Chemistry-General
