Physics-
General
Easy
Question
In specific resistance measurement of a wire using a meter bridge, the key k in the main circuit is kept open when we are not taking readings. The reason is
- the emf of cell will decrease.
- the value of resistance will change due to joule heating effect.
- the galvanometer will stop working.
- none of these.
The correct answer is: the value of resistance will change due to joule heating effect.
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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.
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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?
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