with answers before this exam. Show your works. Part I. Please choose the best a

Question

with answers before this exam. Show your works. Part I. Please choose the best answer. 1. Which one would be an example for carboxylic acid? a) CH3(CH2)sCH c) CH (CHa)COOH b) CH CH2CHO d) (CH3):CHCH=C(CH3)2 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. c) The boiling point essentially remains the same. d) It increases the b.p. b) 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) Lewis acid c) a Bronsted-Lowry base b) an Arrhenius acid.. 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? a) 3 b) 4 c) 5 d) 6 7. Which one has two elements of unsaturation? a) CsHs b) CsH10 c) C4H10 d) CoHre 8. Which one has the relationship of structural isomers? a) b) c) d) Page 1 of 7

Explanation / Answer

Part 1

1.CH3(CH2)COOH is example of carboxylic acid because it contains a (-COOH) group which indicates it is carboxylic.

Hence option (c) is correct.

2. The weaker acids usually have a stable conjugate base. Hence option (a) is correct.

3. increase in number of carbons in alkane  carbon chain, increases the boiling point of compound.
Hence option (d) is correct

4. As the no of carbon increases the ring strain decreases, so cyclohexane has lowest ring strain here, since 6 carbons are there

Hence option (c) is correct.

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