Exercise - ORGANIC CHEMISTRY

i. Which of the following correctly represents the formula for but-2-ene?

• a) ${\mathrm{C}\mathrm{H}}_3\mathrm{C}\mathrm{H}={\mathrm{C}\mathrm{H}\mathrm{C}\mathrm{H}}_3$$\mathrm{CH}_{3}\mathrm{CH} = \mathrm{CHCH}_{3}$
• b) ${\mathrm{C}\mathrm{H}}_2={\mathrm{C}\mathrm{H}\mathrm{C}\mathrm{H}}_2{\mathrm{C}\mathrm{H}}_3$$\mathrm{CH}_{2} = \mathrm{CHCH}_{2}\mathrm{CH}_{3}$
• c) ${\mathrm{C}\mathrm{H}}_3{\mathrm{C}\mathrm{H}}_2\mathrm{C}\mathrm{H}={\mathrm{C}\mathrm{H}}_2$$\mathrm{CH}_{3}\mathrm{CH}_{2}\mathrm{CH} = \mathrm{CH}_{2}$
• d) ${\mathrm{C}\mathrm{H}}_3\mathrm{C}\equiv {\mathrm{C}\mathrm{H}\mathrm{C}\mathrm{H}}_3$$\mathrm{CH}_{3}\mathrm{C}\equiv \mathrm{CHCH}_{3}$

ii. Given the molecular formula ${\mathrm{C}}_4{\mathrm{H}}_{10}\mathrm{O}$$\mathrm{C}_{4}\mathrm{H}_{10}\mathrm{O}$ , which compound is most likely to be represented by this formula?

• a) Butanoic acid
• b) Butan-1-ol
• c) But-2-ene
• d) Butanal

iii. Which of the following is the correct IUPAC name for the compound with the formula ${\mathrm{C}\mathrm{H}}_3{\mathrm{C}\mathrm{H}}_2{\mathrm{C}\mathrm{H}}_2\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{H}$$\mathrm{CH}_{3}\mathrm{CH}_{2}\mathrm{CH}_{2}\mathrm{COOH}$ ?

• a) Butanoic acid
• b) Propanoic acid
• c) Butanal
• d) Butanol

iv. Identify the statement which is true regarding the propan-1-ol and propan-2-ol.

• a) Both have identical condensed structural formula.
• b) They have the same molecular formula.
• c) They are different compounds with the same structural formula.
• d) Propan-1-ol is a carboxylic acid, and propan-2-ol is an ester.

v. Name the compound that can be formed by the esterification of methanol and propanoic acid.

• a) Methyl propanoate
• b) Propyl methanoate
• c) Ethyl propanoate
• d) Propyl ethanoate

vi. Which of the following molecules contains an -OH functional group?

• a) Butane
• b) Ethene
• c) Butan-1-ol
• d) But-2-yne

vii. If a compound ends in "-oic acid", what functional group must it contain?

• a) -OH
• b) -COOH
• c) -C=O
• d) -C=C-

viii. Which formula corresponds to an ester that could be formed from butan-1-ol and ethanoic acid?

• a) CH,CH,CH,CH,COOCH,
• b) CH,COOCH,CH,CH,CH,
• c) CH,CH,CH,CH,CH,COOH
• d) CH,CH,COOCH,