不用查表,下列化合物按沸点降低的次序排列( )。 a.CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>Cl b.n-C<sub>4</sub>H<sub>9</sub>OH c.<img src='https://img2.soutiyun.com/latex/latex.action' />d.<img src='https://img2.soutiyun.com/latex/latex.action' />
化合物<img src='https://img2.soutiyun.com/ask/5124001-5127000/879ee08dcb094843aa7ef4c69e280c92.jpg' />在<sup>1</sup>H NMR中产生的信号数目为______。
化合物<img src='https://img2.soutiyun.com/ask/2020-02-27/951687946601504.png' />在<sup>1</sup>H NMR中各信号的面积比为______。
用少于或等于3个碳的烃合成下列化合物。<img src='https://img2.soutiyun.com/ask/2019-12-31/946621786027764.png' />
下列化合物中带标志质子的化学位移归属正确的应为( )<img src='https://img2.soutiyun.com/ask/2019-12-11/944951185240568.png' />
下列化合物命名正确的是()。<img src='https://img2.soutiyun.com/shangxueba/ask/2021-11/17/1269/20211117143631376.png' />
膜渗透压法测定聚合物相对分子质量,以<img src='https://img2.soutiyun.com/ask/2019-12-19/945621318870222.png' />对c作图,得到的直线的截距随温度的升高而( )。
化合物I的主要生物合成途径为( )。<img src='https://img2.soutiyun.com/ask/uploadfile/6363001-6366000/c196bbf5a718c641f78bf0c228e88516.jpg' />
下列各化合物中,既能溶于酸又能溶于碱的为()。<img src='https://img2.soutiyun.com/shangxueba/ask/68916001-68919000/68916735/964792101435785.png' />
下列化合物中不能进行缩聚反应的是()。<img src='https://img2.soutiyun.com/ask/uploadfile/4104001-4107000/b22d3af414261ba3ba616acb14937534.jpg' />
在下列各种化合物中,分子间有氢键的是()。<img src='https://img2.soutiyun.com/ask/uploadfile/4104001-4107000/e6cbf413be90f33967556d6ce6def66f.jpg' />
下列化合物中,与丙烯醛发生Diels-Alder反应最活泼的是()。<img src='https://img2.soutiyun.com/shangxueba/ask/17850001-17853000/17851740/2016032015121758843.jpg' />
二元气体混合物的摩尔分数y<sub>1</sub>=0.3,在一定的T,p下,<img src='https://img2.soutiyun.com/ask/uploadfile/5064001-5067000/a8dedd767fc43a37c82d190b096f5040.png' />=0.9381,<img src='https://img2.soutiyun.com/ask/uploadfile/5064001-5067000/62987f6d082fee0dfaf987e6bf8d0cee.png' />=0.8812,则此时混合物的逸度系数为( )。
二元气体混合物的摩尔分数y<sub>i</sub>=0.3,在一定的T,p下,<img src='https://img2.soutiyun.com/latex/latex.action' />=0.9381,<img src='https://img2.soutiyun.com/latex/latex.action' />=0.8812,则混合物的逸度系数为( )。
病历摘要:脑膜瘤患者女,55岁,视力下降数月。查体:视力下降,余神经体征阴性。<img src='https://img2.soutiyun.com/shangxueba/ask/21054001-21057000/21056152/2016080411361155670.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/21054001-21057000/21056152/2016080411363213140.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/21054001-21057000/21056152/2016080411363770796.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/21054001-21057000/21056152/2016080411364194722.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/21054001-21057000/21056152/2016080411364682394.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/21054001-21057000/21056152/2016080411365145350.jpg' />
下列化合物不能与<img src='https://img2.soutiyun.com/shangxueba/ask/17844001-17847000/17845710/2016032015180822263.jpg' />发生反应的是()。<img src='https://img2.soutiyun.com/shangxueba/ask/17844001-17847000/17845710/2016032015181816392.jpg' />
下列化合物具有对称中心的是()。<img src='https://img2.soutiyun.com/shangxueba/ask/17841001-17844000/17842509/2016032015265652414.jpg' />
在下列各对化合物中,不为官能团异构体的是()。<img src='https://img2.soutiyun.com/shangxueba/ask/17847001-17850000/17847643/2016032015051956054.jpg' />
下列化合物是内消旋体的是()。<img src='https://img2.soutiyun.com/shangxueba/ask/17844001-17847000/17846852/2016032016283169624.jpg' />
下列化合物中,有手性的是()。<img src='https://img2.soutiyun.com/shangxueba/ask/17850001-17853000/17852141/2016032016260810267.jpg' />
溶解在己烧中的某一化合物。具有最大波长为305m,当溶解在乙醇中时,最大吸收波长为307m。可以判断该吸收是由<img src='https://img2.soutiyun.com/ask/2021-02-02/981126779627176.png' />跃迁引起的()。
若<img src='https://img2.soutiyun.com/latex/latex.action' />,<img src='https://img2.soutiyun.com/latex/latex.action' />试证明时域卷积定理<img src='https://img2.soutiyun.com/latex/latex.action' />和频域卷积定理<img src='https://img2.soutiyun.com/latex/latex.action' />
分子式为C<sub>6</sub>H<sub>10</sub>的化合物A,经催化氨化得2-甲基戊烷。A与硝酸银的氨溶液作用能生成灰白色沉淀。A在汞盐催化下与水作用得到<img src='https://img2.soutiyun.com/ask/2021-01-20/980006566173608.png' />
化合物<img src='https://img2.soutiyun.com/shangxueba/ask/2021-08/13/2/20210813144743341.jpg' />的正确名称是()