Physics-
General
Easy
Question
A particle parallel to x-axis as shown in the figure such that at all instant the y axis component of its position vector is constant and is equal to ‘b’. The angular velocity of the particle about the origin is
- vb
The correct answer is:
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The locus of a projectile relative to another projectile is a
The locus of a projectile relative to another projectile is a
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is the dimensional formula of
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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
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(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
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(A) Positive catalysts increase the rate of reaction.
(R) Catalysts decrease the value of 
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(R) Catalysts decrease the value of
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The rate constant of a reaction does not depend upon:
Chemistry-General
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A plot of log (a - x) against time' t' is a straight line. This indicates that the reaction is of:
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Teflon is an example of:
Teflon is an example of:
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