MCQ
Formaldehyde is used as formalin in industries:
- ATo preserve biological specimens
- BTo prepare bakelite
- ✓Both $A$ and $B$
- DNone of these
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Figure $\xrightarrow[{0\, - \,5\,\,{\,^o}C}]{{HN{O_2}}}$ $P$ $\xrightarrow{{HB{F_4}}}Q$ $\xrightarrow[{Cu,\,\,\Delta }]{{NaN{O_2}}}R$