organic chemistry multiple choice questions please help. 6-10 In carbon NMR of b

Question

organic chemistry multiple choice questions please help. 6-10

In carbon NMR of benzoic acid, the benzene carbon atoms should have chemical shifts in the range of which of the following is the strongest base? In electrophilic aromatics substitution reaction, a cyano (CN) substituent of the aromatic ring is A deactivator and a meta director A deactivator and an ortho-para director An activator and a meta director An activator and an ortho-para director Which one of the following molecules will not undergo chromic acid oxidation? What is true about the relative energy of s-cis and s-trans conformation of 1,3-butadiene? What is true about the relative energy of s-cis and s-trans conformation of 1,3-butadiene? The s-cis conformer is lower in energy that the s-trans The s-trans conformer is lower in energy that the s-cis Two conformers are equal in energy The relative energies cannot be compared because they equilibrate

Explanation / Answer

6) C 110-130

7)option c N-methyl groups donates electrons to N- so the lone pair of electron on N atom is readily available for donation(base)

8) option A a deactivator and meta director

9)third one because it is a 3o alcohol and chromic acid acts only on primary and secondary alcohols and oxidises to ketone and acid respectively

10)option b as the trans conformer has less steric hindrance between two internally oriented hydrogens

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