(11) At position numbers 1, 2 and 5, the free radical will be stabilized by reso

Question

(11)

At position numbers 1, 2 and 5, the free radical will be stabilized by resonance on the adjacent benzene rings.

At position 3, the free radical will be stabilized because it is a tertiary free radical.

So the only position left is number 4, it is not stabilized by any resonance and also it is a primary free radical.

So the position which will be least susceptible to the substitution is number 4.

(12)

The molecules of o-nitrophenol show intra-molecular hydrogen bonding whereas the molecules of p-nitrophenol show inter-molecular hydrogen bonding. Hence o-nitrophenol is more steam volatile because of the presence of hydrogen bonding.

(14)

The typical reaction of a carbonyl group is an addition reaction proceeding through a nucleophilic attack. The reaction shown in option (A) is not a typical reaction for carbonyl group. The reaction in (B) is a typical reaction because it proceeds with a nucleophilic attack followed by the Beckmann Rearrangement reaction.

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95(),(); 31049 4, CHy CH2-CH-CH2 CHt In the structural formula shown above, which of the numbered hydrogen atoms is LEAST susceptible to substitution by Cl radicals? (Assume that the reaction occurs by a free radical mechanism under reaction conditions in which substitution of hydrogen is selective.) (A)1 (B) 2 (C) 3 (D) 4 (E) 5 12. The concept that best explains the greater volatility of o-nitrophenol over p-nitrophenol during steam distillation of a mixture of the two compounds is (A) hyperconjugation (B) hydrogen bonding (C) the ortho-effect (D) resonance (E) symmetry 13. A hexapeptide is hydrolyzed to the dipeptides Ileu-Val, Ala-Pro, and Lys-Leu. Carboxypeptidase acts on the hexapeptide to liberate valine, and 2, 4-dinitroluorobenzene reacts with the hexapeptide to yield, after hydrolysis, 2, 4-dinitrophenylalanine. Which of the following is the amino acid sequence of the hexapeptide? (A) Ala-Pro-Lys-Leu-Ileu-Val (B) Val-Ileu-Lys-Leu-Pro-Ala (C) leu-Val-Ala-Pro-Lys-Leu (D) Val-Ala-Pro-Lys-Leu-leu (E) Lys-Leu-Ala-Pro-Ileu-Val 4. Which of the following reactions is NOT a typical reaction of the carbonyl group ( C-0) ? Pt Br CN

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