Instructions :The next set of questions are assertion type: There are two statements in a sentence. Choose from the options A-E if A. Both statements are true and related B. Both statements are true but not related C.The first statement is true and the second statement is false D. The first statement is false and the second statement is true E. Both statements are false 1. i. Hyperconjugation can stabilise carbocation intermediates BECAUSE secbutyl carbocation can rearrange to a tertbutyl carbocation. ii. Reductive amination requires a hydrogen on the carbonyl carbon to proceed BECAUSE Reductive amination converts only aldehydes to amines iii. Pyridine is more basic than piperidine BECAUSE pyridine is resonance stabilised. iv. Hinsberg test can distinguish between various alkyl halides BECAUSE not all alkyl halides form the benzenesulponamide product is formed from the Hinsberg reaction.
Reactive Intermediates
In chemistry, reactive intermediates are termed as short-lived, highly reactive atoms with high energy. They rapidly transform into stable particles during a chemical reaction. In specific cases, by means of matrix isolation and at low-temperature reactive intermediates can be isolated.
Hydride Shift
A hydride shift is a rearrangement of a hydrogen atom in a carbocation that occurs to make the molecule more stable. In organic chemistry, rearrangement of the carbocation is very easily seen. This rearrangement can be because of the movement of a carbocation to attain stability in the compound. Such structural reorganization movement is called a shift within molecules. After the shifting of carbocation over the different carbon then they form structural isomers of the previous existing molecule.
Vinylic Carbocation
A carbocation where the positive charge is on the alkene carbon is known as the vinyl carbocation or vinyl cation. The empirical formula for vinyl cation is C2H3+. In the vinyl carbocation, the positive charge is on the carbon atom with the double bond therefore it is sp hybridized. It is known to be a part of various reactions, for example, electrophilic addition of alkynes and solvolysis as well. It plays the role of a reactive intermediate in these reactions.
Cycloheptatrienyl Cation
It is an aromatic carbocation having a general formula, [C7 H7]+. It is also known as the aromatic tropylium ion. Its name is derived from the molecule tropine, which is a seven membered carbon atom ring. Cycloheptatriene or tropylidene was first synthesized from tropine.
Stability of Vinyl Carbocation
Carbocations are positively charged carbon atoms. It is also known as a carbonium ion.
Instructions :The next set of questions are assertion type: There are two statements in a sentence. Choose from the options A-E if
A. Both statements are true and related
B. Both statements are true but not related
C.The first statement is true and the second statement is false
D. The first statement is false and the second statement is true
E. Both statements are false
1.
i. Hyperconjugation can stabilise carbocation intermediates BECAUSE secbutyl carbocation can rearrange to a tertbutyl carbocation.
ii. Reductive
iii. Pyridine is more basic than piperidine BECAUSE pyridine is resonance stabilised.
iv. Hinsberg test can distinguish between various
2.
Preamble: A student chemist in an attempt to synthesise compound B from the
i. Predict the chemical name of compound B
ii. What is the reaction name for the chemical transformation of A to B
The attached image contains the scheme of the reaction synthesis.
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