Question

Which of the following is the strongest base?

Hints

Which of the following is the strongest base?

fluoride ion

ethyl anion

amide ion

hydroxide ion

chloride ion

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Part M

What is the general molecular formula for an acyclic hydrocarbon with two triple bonds?

Hints

What is the general molecular formula for an acyclic hydrocarbon with two triple bonds?

CnH2n-6

CnH2n+2

CnH2n-2

CnH2n

CnH2n-4

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Part N

Which of the following has the highest functional group priority in systematic nomenclature?

Hints

Which of the following has the highest functional group priority in systematic nomenclature?

a halogen

an OH group

a double bond

an OR group

a triple bond

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Part O

Which of the following compounds is named correctly?

Hints

Which of the following compounds is named correctly?

1-hepten-5-ol

1-bromo-2,4-cyclohexadiene

5-hexen-1-yne

1-cyclohexen-2-amine

6-methyl-2-cyclohexenol

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Part P

Which of the following is not true about propyne?

Hints

Which of the following is not true about propyne?

The three carbons are linear.

Each pi bond is weaker than any of the sigma bonds.

It contains three pi bonds.

It contains six sigma bonds.

It is also called methylacetylene.

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Part Q

What is the best starting material for the synthesis of 3-bromohexane?

Hints

What is the best starting material for the synthesis of 3-bromohexane?

2-hexyne

2-hexene

1-hexyne

3-hexene

3-hexyne

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Part R

Which of the following is an enol tautomer?

Which of the following is an enol tautomer?

CH3CH2-C(OH)=CH2CH3

CH3CH2-CH=CHCH2OH

CH3C(=O)-CH=CH2CH3

HOCH2CH2-CH=CH2CH3

CH3CH(OH)-CH=CH2CH3

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Part S

What product is formed when 1-butyne undergoes hydroboration-oxidation?

Hints

What product is formed when 1-butyne undergoes hydroboration-oxidation?

CH3CH2-C(OH)=C(OH)H

CH3CH2-C(OH)=CH2

CH3CH2CH2CH=O

CH3CH2-C(=O)-CH3

CH3CH2-CH=CH(OH)

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Part T

How could you synthesize 1-butene from ethyne?

Hints

How could you synthesize 1-butene from ethyne?

Add ethane to ethyne.

Deprotonate ethyne, react with ethyl bromide, and react with hydrogen + Pd/C.

Deprotonate ethyne, react with ethyl bromide, and react with hydrogen and Lindlar' catalyst.

Add propene to methyl bromide.

Deprotonate ethyne and react with ethyl bromide.

Answer 1

Part.L : Ans:- ethyl anion is the correct answer.

Explanation :-

A weak acid has always a strong conjugate base. Because ethane i.e. C₂H₆ is a very weak acid having pk_a greater than 51, therefore its conjugate base i.e. ethyl anion (C₂H₅^-) would be a strong base. On the other hand HF, amide, water and HCl are all stronger acid than C₂H₆, therefore their conjugate bases F^-, amide anion, hydroxide ion and Cl^- respectively must be weak bases than ethyl anion i.e. C₂H₅^- .

Hence ethyl anion is the correct answer.

Part. M : Ans :- C_nH_2n-6is the correct answer.

Explanation :-

A smallest acyclic hydrocarbon with two triple bonds is: H-C≡ C-C≡ C-H or C₄H₂ (i.e.Buta-1,3-diyne) satisfy

C_nH_2n-6general formula for n=4.

Hence C_nH_2n-6is the correct answer.

Part. N : Ans :- -OH group is the correct answer.

Explanation :-

The correct priority order ( highest to lowest) of the given functional group is :

-OH > -OR > alkene (double bond) > alkyne (triple bond) > halogen.

Hence -OH group is the correct answer.

Part. O : Ans :- The correct IUPAC name is : 6-Methyl-2-cyclohexenol .

Explanation :-

-OH functional group should be number first, after that double bond should get lowest number. The correct order of preference of numbering is : Functional group (-OH) > double bond > triple bond > substituent (-CH₃) .

Hence 6-Methyl-2-cyclohexenol is the correct answer.