Which one would be an example for carboxylic acid? a) CH_2(CH_2)_5Ch_3 b) CH_3CH
ID: 972261 • Letter: W
Question
Which one would be an example for carboxylic acid? a) CH_2(CH_2)_5Ch_3 b) CH_3CH_2CHO C) (CH3)_2,CHCH-C(CH_3)_2 d) CH_3(CH_2)_2COOH 2. Generally the weaker acid has a) a stable conjugate base b) required to have a strong conjugate base c) low pKa d) required several hydrogens In the molecule 3. How does an INCREASE in numbers of carbon in alkanes affect the boiling point (b.p.) of an alkane? a) It decreases the b.p. b) It increases the b.p. c) The boiling point essentially remains the same, d) not relevant. 4. Which of the following cycloalkane exhibits the lowest ring strain holder? a) cyclobutane b) cyclopentane c) cyclohexane d) cyclopropane 5. If an alcohol donates H^+ the alcohol Is a) an Arrhenius acid. b) Lewis acid, c) a Bronsted-Lowry base d) None of these. 6. In the lowest energy chair conformation of cis 1,3-dichlorocyclohexane, how many axial positions are occupied by hydrogen atoms?Explanation / Answer
1) Example for carboxylic acid : CH3CH2CH2COOH
2) Weaker acid has high pKa value and less stable conjugate base. A weaker acid has a stronger conjugate base.
So, option b) is correct.
3) The boiling point increases as the number of carbons is increased in an alkane. So, option b) is correct.
4) Cyclohexane exhibits the lowest ring strain. So, option c) is correct.
5) According to arrhenius definition a substance which gives H+ ions in water is called an acid and which gives OH- ions in water is called a base. According to Bronsted-Lowry concept a proton donor is an acid while a proton acceptor is a base. and according to Lewis definition electron pair acceptor is an acid and electron pair donor is a base.
So, If an alcohol donates H+, the alcohol is an Arrhenius acid. so, option a) is correct.
6) all the 6 axial positions are occupied by hydrogen atom. Both the Cl-group occupies equitorial position.
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