Which of the following carbocations is the most stable? Which of the following i

Question

Which of the following carbocations is the most stable? Which of the following is the 1, 4-addition product in the reaction shown below? (3) What is the product of the following Diels-Alder reaction? Addition of one equivalent of HBrto 1, 3-cyclohexadiene gives A. bromocyclohexane. B. 3-bromocyclohexene. C. 4-bromocyclohexene D. 3-bromocyclhexene and 4-bromocyclohexene. In general, the reduction of a ketone to an alcohol can be accomplished by all of the following except one. Which one will not reduce a ketone? A) H_2/Pt B) HIO_4 C) LiAIH_4 D) NaBH_4

Explanation / Answer

1)

In A, + charge is on SP hybridised carbon

In B, + charge is on SP2 hybridised carbon

In C, + charge is on SP2 hybridised carbon

In D, + charge is on SP2 hybridised carbon

+ charge is more stable on SP2 carbon as compared to SP carbon

So, A is least stable

IN B,C,D , D is most stable as + charge is stabilised by resonance of the double bond

Hence D is most stable

Answer: D

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