Question
Which structure is correctly named?
▶️Answer/Explanation
Ans:
C
It has 2 C atoms and one -OH group, hence it is ethanol.
Question
Which compound is correctly named?
▶️Answer/Explanation
Ans: B
It has total 2 carbon atoms and contains -COOH group, hence it is ethanoic acid.
Question
The formulae of two organic compounds, P and Q, are shown.
▶️Answer/Explanation
Ans: B
P has -OH group, hence it is an alcohol.
Q is C4H8 has a C=C bond and has general formula CnH2n hence, it is an alkene.
Question
Which formula represents an alkene?
A CH4 B C2H4 C C2H6 D C2H5OH
▶️Answer/Explanation
Ans:
B
Alkenes have general formula CnH2n hence, B is an alkene.
Question
The structures of some organic molecules are shown.
Which structures represent an alkane with four carbon atoms?
A 1 only B 2 and 3 C 2 and 4 D 3 and 4
▶️Answer/Explanation
Ans: C
Alkanes: General formula CnH2n+2
Alkanes with 4 C atoms will have formula C4H10 . 2 and 4 have 4 C and 10 H atoms and have this formula.
Question
The diagram shows the structure of a simple hydrocarbon and the products of two of its reactions.
Which structures are named correctly?
▶️Answer/Explanation
Ans: B
C2H4 is Ethene as it has C=C.