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What is $\lim_{x \to 0}\frac{\sin\left(\frac 1x\right)}{\sin \left(\frac 1 x\right)}$ ? Does it exist?

limits asked Aug 20, 2018 at 17:43

math.stackexchange.com

19 votes

Why are two three-membered rings preferred to a single five-membered ring in the reaction of a dihalide with alcoholic KOH?

organic-chemistry reaction-mechanism halides elimination asked Jun 25, 2018 at 23:21

chemistry.stackexchange.com

18 votes

The effect of the groups at para position on SN2 reactivity

organic-chemistry nucleophilic-substitution asked May 12, 2018 at 4:20

chemistry.stackexchange.com

14 votes

Evaluating $\int_0^1\frac{3x^4+ 4x^3 + 3x^2}{(4x^3 + 3x^2 + 2x+ 1)^2}\, dx$

calculus integration definite-integrals asked Jul 5, 2018 at 8:11

math.stackexchange.com

14 votes

Leibniz rule derivation

calculus asked Jul 4, 2018 at 10:13

math.stackexchange.com

14 votes

Acidity order of 4-halophenols

organic-chemistry acid-base asked Feb 22, 2018 at 20:28

chemistry.stackexchange.com

13 votes

Explanation of bond angles in the aluminium chloride dimer

inorganic-chemistry physical-chemistry asked Oct 16, 2017 at 19:24

chemistry.stackexchange.com

12 votes

Order of halide nucleophilicity in DMF

organic-chemistry halides nucleophilic-substitution asked Apr 22, 2018 at 20:53

chemistry.stackexchange.com

12 votes

Mechanism of lithium-halogen exchange of primary alkyl iodide

organic-chemistry reaction-mechanism halides organometallic-compounds asked Apr 28, 2018 at 9:02

chemistry.stackexchange.com

11 votes

Why does formic acid give positive Fehling's test?

organic-chemistry reaction-mechanism carbonyl-compounds asked Aug 23, 2018 at 6:07

chemistry.stackexchange.com

Top Answers

Acidity order of nitrophenols

chemistry.stackexchange.com

Reaction molecularity and order

chemistry.stackexchange.com

Why is cis-1,2-dichloroethene more stable than trans-1,2-dichloroethene?

chemistry.stackexchange.com

Which has higher lattice energy: MgO or LiF?

chemistry.stackexchange.com

What is the reason for the exceptional stability of the cyclopropylmethyl carbocation?

chemistry.stackexchange.com

Mechanism of formation of 2-naphthol red dye (aka Sudan 1)

chemistry.stackexchange.com

Why is dinitrogen tetraoxide less stable at high temperature?

chemistry.stackexchange.com

What is non PV work? How is it related to Gibbs energy?

chemistry.stackexchange.com

Why is $n! + n$ always divisible by $n$?

math.stackexchange.com

$\int_{0}^{2008}x|\sin\pi x| dx$

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Are there any substituents other than halogens which are ortho-para directors but ring deactivators?

chemistry.stackexchange.com

Simplify $\frac{25!}{3!}$

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Heating p-Bromobenzenesulfonic acid in the presence of dilute HCl

chemistry.stackexchange.com

There are no integral roots of $x^4-ax^3-bx^2-cx-d=0,$ given $a>b>c>d; \;\;a,b,c,d \in \mathbb N$

math.stackexchange.com

What do "degrees of freedom" refer to?

chemistry.stackexchange.com

What will be area of $|x|+|y|\leq 1$?.

math.stackexchange.com

How to prove that $7^n+3n+8$ is divisible by $9$ for $n\ge1$?

math.stackexchange.com

How to show that $A^3+B^3+C^3 - 3ABC = (A+B+C)(A+B\omega+C\omega^2)(A+B\omega^2+C\omega)$ indirectly?

math.stackexchange.com