Organic chemistry
159 past-paper questions on Organic chemistry · examined 2020–2025.
20258 questions
An organic compound has an Mr of 88. What is the molecular formula of this compound?
Which compound is an alcohol?
An ester has the structural formula CH3COOCH2CH2CH3. What is the name of this ester?
Petroleum is separated into fractions in a fractionating column. Which property of the fractions increases from the bottom to the top of the column?
34 Which compound reacts with hydrogen in an addition reaction? A CH3CHCHCH3 B CH3CH2CH2CH3 C CH3CH2CH2COOH D CH3CH2CH2CH2OH
Three statements about alkanes are listed. Which statements are correct?
35 Which statement about carboxylic acids is correct? A They are prepared by the oxidation of alkanes. B They decolourise bromine water. C They react with alcohols to form esters. D They react with carbonates to form a salt, hydrogen and water.
© UCLES 2025 5070/11/O/N/25 [Turn over 36 The structures of X and Y are shown. C O HO (CH 2 ) 4 C X O OH H 2 N NH 2 (CH 2 ) 6 Y What is the structure of the polymer formed when X and Y react together? C O (CH 2 ) 4 C B O N H (CH 2 ) 6 N H C O (CH 2 ) 6 C C O (CH 2 ) 4 N H N H C O N H C O (CH 2 ) 4 A (CH 2 ) 6 N H C O (CH 2 ) 6 C D O N H (CH 2 ) 4 N H 14
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