Chemistry_2015_STPM term 3_Objectives

How many o bonds are in the propyne molecule, CH₃C = CH?

• 3

• 5

• 6

• 8

The structure formula of warfarin is shown below.

Warfarin is classified as

• an ester

• an aldehyde

• a phenol

• a carboxylic acid

K, L, M and N are isomeric alcohols.

K : CH₃CH₂CH₂CH₂OH

L : CH₃CH(CH₃)CH₂OH

M : CH₃CH(OH)CH₂CH₃

N : (CH₃)₃COH

Which series of alcohols is arranged in order of their increasing boiling points?

• K, L, M, N

• N, M, K, L

• L, K, M, N

• N, M, L, K

The acidity of the following organic compounds can be determined from their pK_a value.

Which is the correct sequence of the compounds according to the ascending order of pK_a values?

• Ⅰ, Ⅱ, Ⅲ, Ⅳ

• Ⅱ, Ⅲ, Ⅰ, Ⅳ

• Ⅳ , Ⅰ, Ⅲ, Ⅱ

• Ⅳ , Ⅲ, Ⅰ, Ⅱ

Cyclohexane, C₆H₁₂, undergoes a free radical substitution reaction with bromine. What is the number of propagation step involved in this reaction to form C₆Br₁₂?

• 6

• 12

• 18

• 24

Which statement is true about 3-methyl-1-butene?

• It has a geometrical isomer

• It is a monomer of natural rubber

• It undergoes nucleophilic addition reaction.

• It reacts with acidified KmnO₄n solution to produce 2-methylpropanois acid.

The compounds C₆H₅CH₂Cl and C₆H₅Cl undergo the same types of reaction towards

• chlorine with the presence of iron (Ⅲ) chloride

• ethanolic solution of potassium cyanide

• aqueous solution of sodium hydroxide

• concentrated ammonia solution

Which hydroxy compound is used as a dye?

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• 
• 

Ethanol could be prepared from different starting materials. Which preparation produces the lowest percentage of ethanol?

• 
• CH₂ = CH₂ + H₂O

  ^H₃PO₄ →CH₃CH₂OH

• _yeast

  C₆H₁₂O₆ →

  2CH₃CH₂OH +

  2CO₂

• CH₃MgBr + HCHO

  _H₃O⁺

  →

  CH₃CH₂OH

Benzoic acid is excreted in urine as hippuric acid. The structural formula of hippuric is shown. Which compounds react to form hippuric acid?

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• 
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