217 - Chemistry Questions Answers

 H₂+ Pd + C  Reagent ... It reduces a C=C to C-C ... Is this addition syn or anti?

Asked By: LUFFY
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Joshi sir comment

It is syn reagent

It is m-CPBA
Asked By: LUFFY
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Joshi sir comment

mCPBA is a good oxidizing agent for alkenes and ketones. Here both are present, in that case mCPBA attacks on alkene. Alkene on OMe side is more reactive. So make epoxide this side. Remember also that stereo nature is not changed in this reaction means cis be cis and trans be trans. 

Does stabilization of a charge mean willingness of other atoms in the molecule to share the charge or the extent of sharing of charge ? If its the 1st then how does that stabilize the charge?

Asked By: LUFFY
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Joshi sir comment

Sharing is the case applicable for the atoms of same electronegativity, thus by sharing electrons (charges) atoms make their orbital configurations stable according to the rules defined for stability.

Is the H on B-carbon sterically hindered ?

Asked By: LUFFY
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Joshi sir comment

Steric hindrance is a relative word, so is compared between two carbons.

Tertiary carbon is always more sterically hindered than primary,

so β carbon is more hindered than α in this compound

Both are separate questions....How to know what reaction is going to occur in each?
Asked By: LUFFY
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Joshi sir comment

In first case reactions involved areReduction of Fe+++,    Fe+++Fe++ Titration step,               6Fe+++K2Cr2O76Fe++++2Cr+++ By using titration reaction, solve the question   

 In second case reaction involved isAs4O6+4I3-As4O10+12I-Now solve

inform if any issue

 

 

 

 

In 1 and 2 ... are the two isomers geometrical iso or optical iso?
Asked By: LUFFY
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Joshi sir comment

1. It is cis-trans pair (no chiral carbon atom so no optical isomerism)

2. has chiral carbon atom so case of optical isomerism, mirror images so dextro and laevo

Balance 

KMnO4+H2SO4+H2S -> K2SO4+MnSO4+S+H2O

                                              

Asked By: LUFFY
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Joshi sir comment

Q.WRITE CELL RECTION OF THE FOLLOWING- .{1} ZN | ZN2+ || cu2+ |cu    {2}    PT {H2} | HCL || CL2{PT}                                       

Asked By: PINKU UMAR
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Joshi sir comment

Zn                  ----------->   Zn++   +   2e-

Cu++ + 2e-   ----------->   Cu

 

 

H2  -------->  2H+  +   2e

Cl+ 2e-      -------->  2Cl-

If each orbital can hold a maximum of three electrons , then the number of elements in 9th period of periodic table

Asked By: VAIBHAV GUPTA
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Joshi sir comment

3/2 times of the previous number of elements

At 752 mm Hg of total Pressure and 301 K Temperature 150 ml H2 is produced and collected over the water, when current is passed through acidic water for 1 hour. How many Amp. current should have passed? ( at 301 K temperature, The pressure of water is 28 mm Hg )

A) 0.320 A

B) 310 A

C) 321 A

D) 0.305 A

please mention correct answer.

Asked By: BONEY HAVELIWALA
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Solution by Joshi sir

by formula PV/T = constant

(752-28)*150/301 = 760*V/273

solve for V, this will be the equivalent volume at STP

now convert this volume in gm by the formula 2V/22400

then finally m = zit, where 

z = 1/96500

solve it for i

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