Explanation
One C - C bond σ−bond and two C - C bonds
II and III have delocalized six electrons π − and hence are aromatic.
(a) RCONHBr and RNCO.
Hyperconjugation effect increases in the order :
(CH3)3 C - < (CH3)2 CH - < CH3CH2 -
0-Nitrophenol because of chelation exists as monomer and hence is steam volatile.
Nitrogen (N2).
The bluish- green flame obtained during Beilstein test is due to the formation of volatile cupric halides. Pyridine and thiourea also give this test because they form volatile cupric cyanide which also gives bluish- green flame.
C60 isotope of carbon is called fullerence.
Resolution.
Both the C-atoms of the double bond of 1-phenyl-2-butene (C6H5CH2 - CH = CH - CH3)carry different substituents and hence it shows geometirical isomerism.
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