User Nilabja

92 votes

2 answers

36k views

What is Bent's rule?

Dissenter

17.9k

asked Aug 26, 2014 at 18:37

40 votes

2 answers

62k views

Why do SN1 and SN2 reactions not occur at sp2 centres?

organic-chemistry nucleophilic-substitution

Jordan Barnes

555

asked Jul 20, 2014 at 14:09

38 votes

10 answers

7k views

Why is chemistry unpredictable?

physical-chemistry experimental-chemistry theoretical-chemistry process-chemistry

Tyler M

475

asked Oct 19, 2020 at 14:56

27 votes

2 answers

17k views

Why do we get slightly more inversion product than retention product in SN1 reaction?

organic-chemistry reaction-mechanism nucleophilic-substitution stereoselectivity

Ritwik Das

2,001

asked Dec 3, 2017 at 6:14

25 votes

1 answer

8k views

What does "reaction coordinate" mean? What does it mean when a reaction has TWO reaction coordinates?

theoretical-chemistry free-energy reaction-coordinate

Dan

1,564

asked May 19, 2012 at 8:27

23 votes

3 answers

2k views

Is "Sulfuric acid... makes a poor electrolyte... very little of it will dissociate into ions" really true? What does that actually mean?

acid-base aqueous-solution conductivity

uhoh

6,248

asked Jun 17, 2021 at 3:07

21 votes

2 answers

3k views

How were elements and molecular formulæ determined in the old days?

analytical-chemistry history-of-chemistry

Nick

663

asked Jul 10, 2012 at 6:00

19 votes

3 answers

10k views

Why are pi bonds only formed when sigma bonds are formed?

bond covalent-compounds valence-bond-theory

Shashank

1,473

asked Jun 7, 2015 at 8:53

16 votes

3 answers

590 views

Why were quasicrystals initially so controversial?

history-of-chemistry

George Kontogeorgiou

179

asked Jun 23, 2021 at 10:11

13 votes

0 answers

192 views

Can pi backdonation occur on non-metal centers?

quantum-chemistry molecular-orbital-theory orbitals surface-chemistry organometallic-compounds

koroma

195

asked May 2, 2019 at 0:47

13 votes

1 answer

24k views

How to rationalise the planar structre of I2Cl6?

bond hybridization molecular-structure halides

Shodai

955

asked Nov 5, 2015 at 4:49

13 votes

2 answers

19k views

What is active mass?

equilibrium concentration

user33789

asked Aug 29, 2016 at 4:22

11 votes

1 answer

4k views

Birch reduction of anisole

organic-chemistry reaction-mechanism aromatic-compounds organic-reduction

Tan Yong Boon

9,444

asked Feb 18, 2018 at 16:21

11 votes

2 answers

1k views

Why does gas particle velocity affect rate of effusion?

physical-chemistry kinetic-theory-of-gases

Daniel B.

263

asked Nov 15, 2012 at 17:29

11 votes

1 answer

5k views

Reasons for low melting point of gallium

molecular-orbital-theory elements melting-point

William R. Ebenezer

2,665

asked Apr 27, 2019 at 12:28

11 votes

1 answer

14k views

Isomerisation of alkanes under Lewis acidic conditions

organic-chemistry reaction-mechanism catalysis hydrocarbons

JM97

3,227

asked Aug 22, 2016 at 12:56

11 votes

1 answer

2k views

Why don't beryllium and magnesium dissolve in ammonia?

inorganic-chemistry solubility alkaline-earth-metals

Ray Bradbury

732

asked Mar 14, 2021 at 14:50

10 votes

1 answer

417 views

Why is a conformer of hydrogen peroxide rotationally inactive?

inorganic-chemistry spectroscopy molecular-structure conformers

Safdar Faisal

6,301

asked Jun 21, 2021 at 6:24

9 votes

2 answers

848 views

Determining if the product would be cis or trans after an anti elimination on fischer projections

organic-chemistry reaction-mechanism stereochemistry elimination cis-trans-isomerism

Prajwal Tiwari

1,128

asked Jun 17, 2021 at 11:56

8 votes

1 answer

29k views

Why methyl group is 2,4-directing?

organic-chemistry aromatic-compounds

Suchal

207

asked Nov 14, 2014 at 16:23

8 votes

3 answers

234 views

Nucleophilicity of sterically hindered enolates

organic-chemistry reaction-mechanism reference-request enolate-chemistry

TRC

1,773

asked Aug 13, 2021 at 10:05

8 votes

1 answer

362 views

Can NaH open the epoxide ring to form alcohol? If so, how?

organic-chemistry reaction-mechanism nucleophilic-substitution

Richie12138

333

asked Aug 21, 2021 at 16:14

7 votes

1 answer

226 views

Why doesn't NGP happen in the bromination of fumaric acid?

organic-chemistry reaction-mechanism nucleophilic-substitution carboxylic-acids

Aspirant

243

asked Aug 15, 2021 at 16:19

7 votes

1 answer

604 views

Electrophillic susbtitution of bromine on styrene and cinnamic acid in the presence of FeBr3, a Lewis acid

organic-chemistry reaction-mechanism electrophilic-substitution c-c-addition

Samardeep singh

482

asked Jun 26, 2021 at 12:30

6 votes

4 answers

1k views

What's the purpose of significant figures in measurements?

experimental-chemistry significant-figures

Tushar

581

asked Jun 11, 2021 at 8:40

6 votes

1 answer

189 views

Why is nitrate anion substituted but bromide anion is not in Von Richter reaction?

organic-chemistry reaction-mechanism nucleophilic-substitution

Samardeep singh

482

asked Jun 19, 2021 at 10:28

6 votes

1 answer

9k views

How to calculate the concentration based on dilution of a stock solution?

concentration

Shaggy

77

asked Apr 19, 2015 at 13:19

6 votes

1 answer

3k views

Why can't terminal alkynes take part in Birch reduction?

organic-chemistry reaction-mechanism hydrocarbons organic-reduction

Hema

617

asked Sep 26, 2018 at 1:29

5 votes

0 answers

207 views

Why is there preferential adsorption of a common ion during preparation of colloids by peptization?

physical-chemistry solutions surface-chemistry adsorption colloids

Samardeep singh

482

asked Aug 26, 2021 at 0:44

5 votes

0 answers

155 views

Analysis of metal carbonyl bonding in Fe(CO)5 using molecular orbitals

physical-chemistry computational-chemistry symmetry

wadey123

51

asked Mar 14, 2016 at 19:35

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What is Bent's rule?

Why do SN1 and SN2 reactions not occur at sp2 centres?

Why is chemistry unpredictable?

Why do we get slightly more inversion product than retention product in SN1 reaction?

What does "reaction coordinate" mean? What does it mean when a reaction has TWO reaction coordinates?

Is "Sulfuric acid... makes a poor electrolyte... very little of it will dissociate into ions" really true? What does that actually mean?

How were elements and molecular formulæ determined in the old days?

Why are pi bonds only formed when sigma bonds are formed?

Why were quasicrystals initially so controversial?

Can pi backdonation occur on non-metal centers?

How to rationalise the planar structre of I2Cl6?

What is active mass?

Birch reduction of anisole

Why does gas particle velocity affect rate of effusion?

Reasons for low melting point of gallium

Isomerisation of alkanes under Lewis acidic conditions

Why don't beryllium and magnesium dissolve in ammonia?

Why is a conformer of hydrogen peroxide rotationally inactive?

Determining if the product would be cis or trans after an anti elimination on fischer projections

Why methyl group is 2,4-directing?

Nucleophilicity of sterically hindered enolates

Can NaH open the epoxide ring to form alcohol? If so, how?

Why doesn't NGP happen in the bromination of fumaric acid?

Electrophillic susbtitution of bromine on styrene and cinnamic acid in the presence of FeBr3, a Lewis acid

What's the purpose of significant figures in measurements?

Why is nitrate anion substituted but bromide anion is not in Von Richter reaction?

How to calculate the concentration based on dilution of a stock solution?

Why can't terminal alkynes take part in Birch reduction?

Why is there preferential adsorption of a common ion during preparation of colloids by peptization?

Analysis of metal carbonyl bonding in Fe(CO)5 using molecular orbitals