Recently Active Chemistry Questions

*Image* edit: not naoch but naoch3 ...

How was NSEC?? there;s no topic for chem olympiads.. so posted here.. discussions on questions welcome ...

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CH3NHCH2CHO+CH3MgBr-> ? ...

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A tribromobenzene gives 2 isomers when mononitrated.Why can't the compound be 1,2,4 - tribromobenzene? ...

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why is cyclohexane more stable than cyclopentane ...

Which of the following ionisation energy order is/are correct : (A) F > cL- (B) F > cL (C) cL>F - (D) CL - > F - ...

There is a section in Redox reactions Paradox of fractional oxidation no.I have understood the concept but i could not understand one thing that how do we calculate the real oxidation numbers of elements in a compoud.could an ...

1) a weak base BOH is titrated with st acid .The pH at 1/4th equivalence point was 9.24.Enough strong base(6 meq) was now added to completely convert the salt.the total voume was 50ml.find pH at the point 2)A soln is saturate ...

Q1 A sample of AgCl treated with 5mL 1.5M Na2CO3 .The remaining sln cotained 0.0026 gm of Cl- per litree.Calculate Solubity product of AgCl. Ksp=8.2*10-12 Q2 how many moles of sodium propionate should be added to 1 L of an aq ...

which would you expect to have larger(more negative) value of hydration energy : K+ or Ba2+ ? think it's K+ due to smaller size of K+,but answer given is Ba2+.Please verify. ...

According to transition state theory, rate constant (K) will depend on 1. Temperature 2. Threshold energy 3. Entropy change from reactant to transition state 4. Collision frequency ...

Can someone please post the key to the Match Matix question (Thermodynamics) that was there in the chemistry in paper 1 Thanks ...

1.B.P of H2O(l) increases when a.pressure is increased b.pressure is decreased c.when studied at mountain 2.consider the endothermic reaction; Fe3+ + cl- → Fecl2+ Eq. may be disturbed by : a.addition of Fe(NO3)3 b.addition ...

Predict the major product of the given reaction :- *Image* ...

*Image* find the order of dehydration...with reason... ...

*Image* On what basis are the nucleophilic strengths being decided? Which oxygen is more nucleophilic - A or B ? ...

How many total no of structural isomers r possible for C4H7cL having parent chain of 4 carbons? ...

im having a very basic doubt regarding "oxidation state".how can nitrogen have +5 oxidation state when it does not have a d-orbital??is it neccessary to have n "unpaired" electrons to show +n ox. state?and how is its maximum ...

Bent's rule is consistent with VSEPR theory. Accord. to Bent's rule, the more electronegative substituent attaches itself to hybrid orbital that contains more p-charach./less s-character. 1) Molecule/ion inwhich Bond angle is ...

which one is more reactive: alkene or alkyne? what is da case for (1)GENERAL rxns and for (2)Hydrogenation specifically?? pl giv reason also thnx ...

1) In the arrhenius eqn which of the following statement is assumed (A) The fraction of efeective collisions having activation energy is equal to the fraction of total collisions having activation energy (B) The fraction of e ...

Ques 1) CaS exists in a cubic close packed arrangement of S2- ions in which Ca2+ ions occupy 1/2 of the available tetrahedral holes. How many Ca2+ and S2- ions are contained in the unit cell ? (a) 1,1 (b) 2,4 (c)4,4 (d)4,2 Qu ...

PLz discuss this prob??? At pH=2, E°quinhydrone=1.3 , then Equinhydrone=???? a)1.36V b) 1.3 c)1.42 d)1.2 ...

Ques 4) Find the product formed in this reaction:- C6H5 - O - CH3 + HI ---(heat)→ ??? Ques 5) *Image* ...

If a cube is made such that small spheres are at the corners and large sphere is at the body centre of the cube, then what is the packing fraction of this system? 1. 0.68 2. 0.74 3. 0.52 4. 0.002 ...