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Worksheets3.3.1 Introduction to organic chemistry
Total questions: 44
Worksheet time: 22mins
Which can be both an empirical and molecular formula of a stable compound?
CH2O
P4O10
NH2
CH3
Which compound is a structural isomer of Z-but-2-ene?
butane
E-but-2-ene
cyclobutane
methylbut-2-ene
The correct name for the alkene monomer which forms the polymer shown below is
2-methyl-3-ethylpropene
2-methylpent-2-ene
2-methylpent-3-ene
4-methylpent-2-ene
The correct systematic name for the compound in the image is
2-ethyl-3,4-dimethylpent-2-ene
4-ethyl-2,3-dimethylpent-3-ene
2,3,4-trirnethylhex-3-ene
3,4,5-trimethylhex-3-ene
The correct systematic name for the compound in the image is
2,3-diethylbut-2-ene
2-ethyl-3-methylpent-2-ene
4-ethyl-3-methylpent-3-ene
3,4-dimethylhex-3-ene
Which one of the following is the correct name for
2-bromo-3-methylpent-2-ene
2-bromo-3-ethylbut-2-ene
3-bromo-2-ethylbut-2-ene
4-bromo-3-methylpent-3-ene
The structural formula of ethyl 2-methylpropanoate is
CH2O is the empirical formula of
methanol
methyl methanoate
ethane-1,2-diol
butanal
Which equation represents an initiation step?
Which statement is correct about the molecule shown?
It reacts with HBr in an electrophilic substitution reaction.
It reacts with NaBH4 in a nucleophilic addition-elimination reaction.
It reacts with ethanolic KOH in an elimination reaction.
It reacts with KCN in a nucleophilic substitution reaction.
Which equation is a propagation step in the conversion of trichloromethane into tetrachloromethane by reaction with chlorine in the presence of ultraviolet light?
CHCl3 + Cl2 ⟶ CCl4 + HCl
●CCl3 + ●Cl ⟶ CCl4
CHCl3 + ●Cl ⟶ CCl4 + ●H
●CCl3 + Cl2 ⟶ CCl4 + ●Cl
The reaction sequence shows how CH3CH3 can be converted into BrCH2CH2Br
Which step occurs by nucleophilic substitution?
Step A
Step B
Step C
Step D
In concentrated alkali, propanone reacts with hydroxide ions to form an equilibrium mixture as shown.
Which curly arrow does not appear in the mechanism of this reaction?
Which of the arrows, labelled A, B, C or D in the mechanism in the diagram, is not correct?
A
B
C
D
Which of the following is a correct mechanism for the formation of 2-methylbut-2-ene from 2-bromo-3-methylbutane?
Which one of the following types of reaction mechanism is not involved in the above sequence?
free-radical substitution
nucleophilic substitution
elimination
nucleophilic addition-elimination
Refer to the following reaction sequence:
Which one of the following types of reaction mechanism is not involved in the above sequence?
electrophilic addition
electrophilic substitution
addition−elimination
elimination
Which one of the following mechanisms is not involved in the reaction sequence below?
CH3CH3 → CH3CH2Cl → CH3CH2OH → CH2=CH2 → CH3CH2Br
electrophilic addition
electrophilic substitution
nucleophilic substitution
free-radical substitution
In which of the following is a curly arrow used incorrectly?
Which one of the following can react both by nucleophilic addition and by nucleophilic substitution?
In which one of the following are the curly arrows not used correctly?
How many structural isomers with an unbranched carbon chain have the molecular formula C4H8Br2?
4
5
6
7
How many structural isomers with the molecular formula C5H10O react with Tollens’ reagent?
3
4
5
6
How many structural isomers are there with the molecular formula C3H6BrCl?
4
5
6
7
Which compound does not show stereoisomerism?
1,2-dichloropropene
1,2-dichloropropane
1,3-dichloropropene
1,3-dichloropropane
What is the total number of structural isomers with the molecular formula C2HBrClF3?
2
3
4
5
Which is a pair of functional group isomers?
Z-Retinal, shown in the diagram, is a component in vitamin A.
Which of the double bonds, labelled A, B, C or D, is responsible for the letter Z in the name?
A
B
C
D
How many isomers have the molecular formula C5H12?
2
3
4
5
How many structural isomers have the molecular formula C4H9Br?
2
3
4
5
How many secondary amines have the molecular formula C4H11N?
2
3
4
5
The structure of cyclohexene is shown.
Which of the following is the general formula of cyclic alkenes such as cyclohexene?
CnH2n–4
CnH2n–2
CnH2n
CnH2n+2
Which one of the following can exhibit both geometrical and optical isomerism?
(CH3)2C=CHCH(CH3)CH2CH3
CH3CH2CH=CHCH(CH3)CH2CH3
(CH3)2C=C(CH2CH3)2
CH3CH2CH(CH3)CH(CH3)C=CH2
How many different alkenes are formed when 2-bromo-3-methylbutane reacts with ethanolic potassium hydroxide?
2
3
4
5
The compound cis-retinal is shown below.
Which one of the labelled bonds leads to the prefix in the name?
A
B
C
D
Which one of the following is a pair of functional group isomers?
CH3COOCH2CH3 and CH3CH2COOCH3
(CH3)2CHCH(CH3)2 and (CH3)3CCH2CH3
CH3CH2OCH3 and (CH3)2CHOH
ClCH2CH2CH=CH2 and CH3CH=CHCH2Cl
Propanone can be reduced to form an alcohol. A functional group isomer of the alcohol formed is
CH3CH2CH2OH
CH3CH2CHO
CH3OCH2CH3
CH3COCH3
For this question refer to the reaction scheme below.
Which one of the following statements is not correct?
W and Y are structural isomers.
Z is a primary alcohol.
Y gives two peaks in its proton n.m.r. spectrum.
X has geometrical isomers.
This question concerns the preparation of the plastic poly(methyl 2-methylpropenoate) (Perspex), starting from propanone.
Which one of the following is not a structural isomer of Compound M?
The number of structural isomers of C3H2Cl6 is
2
3
4
5
How many structural isomers, which are aldehydes, have the molecular formula C5H10O?
2
3
4
5
How many structural isomers, which are esters, have the molecular formula C4H8O2?
2
3
4
5
Isomers of the ester HCOOCH2CH2CH3, include
(i) ethyl ethanoate
(ii) methyl propanoate
(iii) butanoic acid
(iv) butyl methanoate
(i), (ii) and (iii) only
(i) and (iii) only
(ii) and (iv) only
(iv) alone
The number of structural isomers of molecular formula C4H9Br is
5
4
3
2
