N-氧化吡啶硝化时,
主要进入( )。
A: α位
B: γ位
C: α和β位各一半
D: β位
主要进入( )。A: α位
B: γ位
C: α和β位各一半
D: β位
举一反三
- 丙烯与HBr加成,有过氧化物存在时,其主要产物是( )。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/0508a7ebaaa146a4bf377b608a89a47a.png" />,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/cb47e5a8d620401fbfe813768a96bc67.png" />各一半 B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/deb8c0a08872446f81a23feb1249b0f2.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/cb47e5a8d620401fbfe813768a96bc67.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/0508a7ebaaa146a4bf377b608a89a47a.png" />
- 化学法鉴别吡啶和α-甲基吡啶,加入( )。 A: HCl B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/ec29052bf35b43e3ba0473b5cfc6ec40.png" />溶液 C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/ba750919b17e4897b04acbfd77854c18.png" />溶液 D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/970b9de687064f8084c971a3335c249b.png" />
- 哪个标记用于表示 HTML 文档的结束？( ) A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/6c4425eb00dd44f2a456cd3fa4e18488.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/0db52a7ca0c0403d9f0e9f9784a1c655.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/0f4f1b4846f940448a74df9e286abc77.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/0dfd6a6c8d0f4ed2872185be16c2a849.png" />
- N-氧化吡啶硝化时, 主要进入()。 A: α位 B: β位 C: γ位 D: α和β位各一半
- 下列化合物中哪个具有芳香性?( ) A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/f459ad245e0b421b8c408034349962e2.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/bbd772711b5845fa810365b224ba5b78.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/b9e471ec661a474697375481122a9ae9.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202111/9f0b52aec3cd4bc8b4d0da7317a27903.png" />