Which one of the following compounds fits the C-13 NMR spectrum shown below? Whi

Question

Which one of the following compounds fits the C-13 NMR spectrum shown below? Which of the following aromatic compounds reacts faster than benzene in electrophilic aromatic rumination? What is the electrophile in the Frieda-Crafts alkylation reaction below ? A) AICI_3 B) CI" C) benzene D) (CH_3)_3 C^+ What is the major product of the following reaction? A. 4-ethyl-2-nitrophenol B. 1-ethyl-4-nitrobenzene C. 4-ethyl-3-nitrophnecl D. 4-nitrophenol Identify the preferred site(s) of electrophilic attack on the following compound. A) ortholpara positions on ring 1 B) meta position on ring 1 C) ortholpara positions on ring 2 D) meta positions on ring 2

Explanation / Answer

28)

D) Correct option.

Explanation- The C-13 NMR spectrum for cyclohexene has three peaks at 127.31, 25.31and 22.81 ppm The peak for the two carbons in the C=C double bond is furthest. TMS is used as standard.

29)

C) Phenol is correct.

Explanation- In electrophilic aromatic substitution reactions an electrophile replaces one or more hydrogen atoms attached to the aromatic ring. Phenols are highly prone to electrophilic substitution reactions, due to rich electron density. Due to highly activating effect of hydroxyl group in phenols, bromination is faster in phenol.

30)

D) (CH3)3C+ is correct option

Explanation- Electrophilic species, the carbocation (CH3)3C+ formed by the removal of the halide by the Lewis acid catalyst AlCl3.

31)

A) 4-ethyl-2-nitrophenol is correct

Explanation- Hydroxyl groups can donate lone pairs, and any electron-donating group will be ortho/para directing.

32)

C)ortho/para positions on ring 2

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