MCQ
The entropy of a perfectly crystalline solid at absolute zero is
- APositive
- BNegative
- ✓Zero
- DNot definite
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$(i)$ Hinsberg test
$(ii)$ Carbyl amine test
$(iii)$ Hofmann mustard oil test
$(iv)$ $HNO_2$ test

$Br^-+ CH_3OH \rightarrow BrCH_3 + OH^-,$ is due to