下列化合物中R构型的是（）。https://assets.asklib.com/psource/2016032016270681821.jpg

A . 富马酸 B . 枸橼酸 C . 乳糖酸 D . 马来酸 E . 酒石酸

A . R O B . HRO C . NaR D . HRO

A . 恩氟烷 B . 盐酸氯胺酮 C . 盐酸普鲁卡因 D . 依托咪酯 E . 盐酸利多卡因

A . 红外光谱 B . Mosher法 C . X-ray衍射 D . 旋光谱

A . 正反应为吸热反应，L为气体 B . 正反应为吸热反应，L为固体 C . 正反应为放热反应，L为气体 D . 正反应为放热反应，L为固体或液体

A . A B . B C . C D . D

A、       COOH HO   ╬      H       CH3 B、        COOH   H     ╬    OH        CH3 C、        CH2Br  HO    ╬     H        CH2OH D、       CH3   H   ╬    OH       CH2OH

A.<img src='https://img2.soutiyun.com/ask/2020-09-21/969550318402804.png' /> B.<img src='https://img2.soutiyun.com/ask/2020-09-21/969550327262311.png' /> C.<img src='https://img2.soutiyun.com/ask/2020-09-21/969550340630075.png' /> D.<img src='https://img2.soutiyun.com/ask/2020-09-21/969550350252626.png' />

<img src='https://img2.soutiyun.com/ask/2020-11-20/974714776394622.png' />

<img src='https://img2.soutiyun.com/shangxueba/ask/51132001-51135000/51134603/971370051188662.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-23/964343656911442.png' />

指出下列结构式所代表的是哪有类化合物(例如：双糖、吡喃戊醛.....)，指出它们的构型(D或L)及糖苷键类型。 <img src='https://img2.soutiyun.com/ask/2021-01-22/980177313851944.png' /> <img src='https://img2.soutiyun.com/ask/2021-01-22/980177325466608.png' />

A:对 B:错

<img src='https://img2.soutiyun.com/shangxueba/ask/17841001-17844000/17841552/2016032014323332367.jpg' /> A．A B． B C． C D． D

(1)<img src='https://img2.soutiyun.com/ask/2020-10-20/972053624653891.png' />(2)<img src='https://img2.soutiyun.com/ask/2020-10-20/972053635151492.png' /> (3)<img src='https://img2.soutiyun.com/ask/2020-10-20/972053684937339.png' />(4)<img src='https://img2.soutiyun.com/ask/2020-10-20/972053674654751.png' />(5)<img src='https://img2.soutiyun.com/ask/2020-10-20/972053694889908.png' />

<img src='https://img2.soutiyun.com/ask/2020-08-26/967309410052268.png' /> <img src='https://img2.soutiyun.com/ask/2020-08-26/967309421855943.png' />

<img src='https://img2.soutiyun.com/ask/2021-02-20/982666750273954.jpg' /> <img src='https://img2.soutiyun.com/ask/2021-02-20/982666758571429.jpg' />

<img src='https://img2.soutiyun.com/ask/2021-01-21/980085530975438.png' />

<img src='https://img2.soutiyun.com/ask/2020-10-16/971693774665162.png' />

A．分子中有两个手性碳原子，但只有个对映异构体 B．药用为R，R-构型，右旋光性 C．与铜离子在酸性条件下生成一分子合物显红色，在pH7．5时形成两分子螯合 D．体内代谢途径为氧化，羟基氧化为醛，进而氧化为酸 E．抗菌机制可能为与二价金属离子如Me2+结合干扰RNA的合成