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Chapter 1: Problem 131

(a) \(\alpha\) -methyl-p-bromophenyl acetic acid (b) 2 - \((4\) -bromophenyl) propanoic acid (c) 2 -methyl \(\mathrm{p}\) -bromophenyl acetic acid (d) p-bromophenyl propionic acid

Short Answer

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Question: Identify the parent chain, substituents, and functional groups for each of the given organic compounds: a) α-methyl-p-bromophenyl acetic acid b) 2-(4-bromophenyl)propanoic acid c) 2-methyl p-bromophenyl acetic acid d) p-bromophenyl propionic acid

Step by step solution

01

Compound (a): \(\alpha\) -methyl-p-bromophenyl acetic acid

To identify substituents and functional groups of this compound, first, identify the parent chain as an acetic acid which contains a carboxylic acid group (-COOH) bonded to a phenyl ring. The term \(\alpha\) -methyl refers to a methyl group (-CH3) on the carbon atom adjacent to the carboxylic acid group. The p-bromophenyl represents a bromine atom (-Br) bonded to a phenyl ring at the para position. Structure: CH3CH(COOH)(CH2)C6H4Br
02

Compound (b): 2 - \((4\) -bromophenyl) propanoic acid

To identify substituents and functional groups of this compound, first, identify the parent chain as a propanoic acid, which contains a carboxylic acid group (-COOH) attached to a propyl chain. The 2 - \((4\) -bromophenyl) indicates the presence of a bromophenyl group attached to the second carbon of the propyl chain and the presence of a bromine atom (-Br) bonded to a phenyl ring at the 4th position. Structure: CH3CH(BrC6H4)CH2COOH
03

Compound (c): 2-methyl \(\mathrm{p}\) -bromophenyl acetic acid

To identify substituents and functional groups of this compound, first, identify the parent chain as an acetic acid which has a carboxylic acid group (-COOH) bonded to a 2-methyl phenyl ring. The p-bromophenyl indicates the presence of a bromine atom (-Br) bonded to the phenyl ring at the para position. Structure: CH3COO(C6H4CH3)Br
04

Compound (d): p-bromophenyl propionic acid

To identify substituents and functional groups of this compound, first, identify the parent chain as a propionic acid, which contains a carboxylic acid group (-COOH) attached to a propyl chain. The p-bromophenyl indicates that a phenyl ring with a bromine atom (-Br) at the para position is bonded to the propyl chain. Structure: CH3CH2CH2C6H4BrCOOH

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Most popular questions from this chapter

Which of the following statements is/are correct about H-bonding? (a) \(\mathrm{n}\) -Butanol has a higher boiling point than diethylether on account of intramolecular H-bonding. (b) Maleic acid is a stronger acid than fumaric acid due to the stabilization of the resulting anion by intramolecular H-bonding. (c) \(\mathrm{p}\) -nitrophenol is steam volatile due to intramolecular hydrogen bonding. (d) Hydrogen bond formation intramolecularly involving one molecule only is known as chelation and when formed intermolecularly is known as association.

4-Nitroaniline is a weaker base compared to 4 -cyanoaniline. This is because (a) both nitro and cyano are strong electron withdrawing groups. (b) the lone pair of nitrogen of the \(\mathrm{NH}_{2}\) group is delocalised in 4 -nitro aniline and not in 4 -cyanoaniline. (c) the negative charge resides on the more electronegative oxygen in nitro aniline in the resonance delocalization. (d) cyano group is aligned planar with the ring.

Which of the following carbanions is most stable? (a) \(\mathrm{CH}_{3} \mathrm{CH}_{2}\) (b) \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{2}^{-}\) (c) \(\mathrm{C}_{6} \mathrm{H}_{5}-\mathrm{CH}_{2}-\mathrm{CH}_{2}^{-}\) (d) \(\mathrm{ClH}_{2} \mathrm{C}-\overline{\mathrm{C}}\left(\mathrm{CH}_{3}\right)_{2}\)

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The most stable free radical among the following is (a) C=CC(C)C (b) c1ccccc1 (c) \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}\) (d) \(\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}_{2}-\mathrm{CH}_{2}\).
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