All Questions
Tagged with elimination halides
23
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What is the enthalpy change for elimination reactions of alkyl halide - exothermic or endothermic?
There are a few questions in thermodynamics (with unverified data) that the addition reaction of ethene to give ethyl chloride has a +ve enthalpy change, thereby elimination to give alkene must be ...
- 759
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1
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462
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Substitution or elimination when a chloroalkene reacts with NaOH in ethanol?
NaOH + EtOH will eliminate the Cl atom forming a double bond. At least, that's what I think. 3 could also be a viable answer since the OH can also attack the said double bond (this is probably not ...
- 13
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What would be the product(s) when 2-iodobutane is heated with tertiary butoxide?
The following question from Black Book Organic Chemistry IIT JEE Advanced Level Papers [1]:
Choose the correct option(s) among the following about [P]:
A) Two C−H bonds in [P] are involved in ...
- 139
2
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70
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Why do active methylene compounds give Sn2 reactions?
I dont understand why they are strong nucleophiles when the negative charge is resonance stabilised. Also it is bulky, is there any chance of elimination?
- 21
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Reaction of aqueous KOH and alcoholic KOH with alkyl halide [duplicate]
CONTEXT:
Here's reaction of alkyl halide with aqueous $\ce{KOH}$
and here's the reaction for dehydrohalogenation by alcoholic $\ce{KOH}$
Question
Initially $\ce{KOH}$ is aqueous. On reacting with ...
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Dehalogenation of vicinal dihalo alkanes
Which mechanism will the following reaction follow?
Will it follow E2 mechanism?
If yes, then how would 2,3-dibromobutane undergo this reaction?
Does it form both cis and trans butene or is the ...
- 471
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0
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164
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Find the major products when these cyclohexenone bromides react with caustic potash in alcoholic medium:
Question:
Also find the order of the rates of the given reactions.
Answer: The answer of this question is given as option 'D' ie. all products are identical, however I am getting the answer as ...
- 197
-1
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1
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76
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Comparing between nucleophilic and basic strength of acetylene ion [closed]
Question
In this question I understand that 2 reactions- Substitution and elimination- will occur. But which will be major?
- 623
3
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1
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492
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Comparing between SN2 and E2
Question
I am confused between the questions B. And C. The earlier is SN2 and later is E2. But what makes the difference?
- 623
2
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1
answer
841
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Reaction of alc. KOH with alkyl halide
The following question was given in FIITJEE study material:
At first, I thought it should be elimination. But, soon I realized that there is no heating, plus a primary alkyl halide is used. So, "...
- 3,071
2
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2
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2k
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Reactivity of primary and tertiary alkyl halides
From USNCO 2004, Q58:
The reaction between which pair of reactants occurs the fastest for $[\ce{OH-}] = \pu{0.010 M}$?
(A) $\ce{CH3CH2CH2CH2Cl + OH-}$
(B) $\ce{(CH3)3CCl + OH-}$
(C) $...
- 1,381
4
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2
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1k
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Can vicinal dihalide produce conjugated alkene in strong base?
In Klein's Organic Chemistry (3rd edition), p. 410, we learn that vicinal dihalide can produce alkyne in strong base. And on Reaxys I see many reactions of this sort. For example:
However, why isn't ...
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19
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3
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Why are two three-membered rings preferred to a single five-membered ring in the reaction of a dihalide with alcoholic KOH?
The given answer is 1,1-dicyclopropylmethanone:
Step 1 is abstraction of acidic H by the strong base. Then, there's surely going to be anchimeric assistance. But there can be two places where the ...
- 5,501
4
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1
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Reaction of dihalides with excess of NaNH2
Gem-dihalides react with $\ce{NaNH2}$ to give terminal alkynes. Why is a terminal alkyne prefered?
For example,
I had thought that 2-pentyne would be preferred over 1-pentyne as it would be more ...
user63618
5
votes
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Reaction of alkyl bromide in presence of piperidine
What are the products of this reaction? I believe there'll be E2 elimination to give the products. Not sure. Help would be greatly appreciated.
The above is the product which I thought might be ...
