Older MCQs might not have the typical A, B, C,
D
choices. They
have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such
combinations to the answer.
A
1, 2 and 3 are correct
B
1 and 2 only are correct
C
2 and 3 only are correct
D
1 only is correct
Define structural isomers as compounds with the same molecular formula, but different structural formulae, including (C_4H_{10}) as (CH_3CH_2CH_2CH_3) and (CH_3CH(CH_3)_2CH_3) and (C_4H_8) as (CH_3CH_2CH=CH_2) and (CH_3CH=CHCH_3)
State that hydrocarbons are compounds that contain hydrogen and carbon only
Name and draw the structural and displayed formulae of unbranched: (a) alkanes (b) alkenes, including but-1-ene and but-2-ene (c) alcohols, including propan-1-ol, propan-2-ol, butan-1-ol and butan-2-ol (d) carboxylic acids containing up to four carbon atoms per molecule
