More practice questions

4. Q4. Give the IUPAC name of HOCH₂CH₂CH(OH)CH₃.

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   Four carbons, –OH on C1 and C3 when numbered from the CH₂OH end (the set {1, 3} beats {2, 4}); the “e” stays: butane-1,3-diol (NCERT page 196; reasoned).

5. Q5. Give the common and IUPAC names of CH₃CH₂CH₂OCH(CH₃)CH₂CH₃.

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   Common name: sec-butyl propyl ether (groups in alphabetical order). IUPAC name: the larger group, the four-carbon sec-butyl, is the parent butane, with propoxy on its C2: 2-propoxybutane (reasoned from NCERT page 198).

6. Q6. Name the phenol with –OH and –NO₂ on adjacent ring carbons, by IUPAC and by its common ortho name.

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   2-Nitrophenol, o-nitrophenol: phenol is the parent, with –OH on C1 and –NO₂ on C2 (reasoned from NCERT pages 196–197).