您所在的当前位置：高中化学试题 >

分子式、结构式、结构简式、实验式

> 苯、乙烷、乙烯、乙炔分子中的碳碳键的键长分别为a、b、c、d，它们之间的大小顺序为（　　） A．a＞b＞c＞d B．b＞a＞c＞d C．b＞c＞d＞a D．b＞c＞a＞d

问题：

发布时间：2024-09-08

苯、乙烷、乙烯、乙炔分子中的碳碳键的键长分别为a、b、c、d，它们之间的大小顺序为（　　）

A．a＞b＞c＞d B．b＞a＞c＞d C．b＞c＞d＞a D．b＞c＞a＞d

参考答案：

提问用户：2e***tPG

可能感兴趣的题目：

1 阅读理解。 September can be a depressing month. The summer holidays are over, it"s time to go back to work or school and Christmas is four months away. However, for some people it"s the perfect time to get away. These days more and more people are taking their holidays late in the year and for good reasons. Holidays in autumn can be cheaper, the resorts are less crowded and the weather isn"t as extreme as it is in the summer. So, where are the best places to go? Here are our top tips. Sardinia (in Italy) has an average temperature of 27℃ in September. It also has "Autunno in Barbagia" (Autumn in Barbagia) a series of festivals that take place in 27 villages in Barbagia, a mountainous region of inland Sardinia. The festivals continue from September to December, so there"s always something happening. There are street markets, craft workshops and there"s lots of eating and drinking (This is Italy, after all). Dubrovnik Croatia has become very popular in summer but it"s quieter and more pleasant once the crowds have left. The weather is still warm but less humid. You can take a ferry to the popular beaches on the islands of Sunj and enjoy it with locals. Dahab Egypt, is extremely hot in the summer with temperatures up to 38℃. However, the autumn is cooler while the sea is still warm. This makes Dahab the perfect place for snorkeling and windsurfing. There are also interesting historical sites to visit such as the Coloured Canyon, with its dramatic rock formations, and St Catherine"s Monastery, at the foot of Mount Sinai. Kas is a relaxed fishing village on the Lycian coast in southern Turkey. There are plenty of things to do and the temperature has dropped (so you can actually enjoy doing them!) Kas is a good place to stay if you want to walk part of the Lycian way: a long-distance footpath that stretches for 500km from Fethiye to Antalya through the ancient land of Lycia. There are also watersports, of course. The best time to go diving is supposed to be after the first rains of autumn (usually between late September and early October) when the fish become most active. Marrakech Morocco is another good destination. The city itself is a fascinating place to spend a few days. When you have had enough of that, go to Tigmi, a beautiful hill town about 20 kilometers away. There"s a hammam (a Turkish bath) and a large heated pool, which makes it the perfect place to relax. Wherever you go this autumn - have fun! 1. Here are the good reasons for more and more people to take holidays in autumn except that _____. A. Holidays in autumn can be cheaper. B. The scenery in autumn is more attractive. C. The resorts in autumn are less crowded. D. The weather is neither too hot nor too cold. 2. We can infer from Paragraph 3 that _______. A. Visitors can take part in a series of festivals in October in Barbagia. B. Barbagia in Sardinia is surrounded by mountains. C. The festivals continue from September to November. D. The temperature in Sardinia in September is always below 27℃. 3. The underlined word "ferry" in paragraph 4 refers to a kind of _______. A. bus B. plane C. boat D. taxi 4. For someone who enjoys walking, __________ is the best choice. A. Kas B. Marrakech C. Dahab D. Dubrovnik 5. Which of the following places may not be close to sea? A. Dubrovnik B. Dahab C. Kas D. Marrakech
2 甲、乙、丙三人在同一办公室工作，办公室里只有一部电话机，设经该机打进的电话是打给甲、乙、丙的概率依次为、、。若在一段时间内打进三个电话，且各个电话相互独立，求：(1)这三个电话是打给同一个人的概率； (2)这三个电话中恰有两个是打给甲的概率．
3 默写。（6分）（任选6空，超过6空，按前6空评分）小题1:问君何能尔? 。（陶渊明《饮酒》）小题2: ，不如须臾之所学也。（苟子《劝学》）小题3: ，何似在人间! (苏轼《水调歌头》) 小题4:不义而富且贵，。（《〈论语〉七则》）小题5: ，阴阳割昏晓。（杜甫《望岳》）小题6: ，不能成方圆。（《孟子·离娄上》）小题7:一夫当关，（李白《蜀道难》）小题8:月子弯弯照几州，。（杨万里《竹枝歌》）
4 抛物线 x2=y的焦点坐标是（　　） A．（0，1） B．（0，） C．（1，0） D．（，0）
5 某食品厂定期购买面粉，已知该厂每天需要面粉6吨，每吨面粉的价格为3200元，面粉的保管等其它费用为平均每吨每天3元，购买面粉每次需要支付运费900元。（Ⅰ）求该厂每隔多少天购买一次面粉，才能使平均每天支付的总费用最少？最少费用为多少？（Ⅱ）某提供面粉的公司规定：当一次购买面粉不少于120吨时，价格可享受9.5折优惠，问该厂是否考虑利用此优惠条件？请说明理由。
6 （12分）如图，在正方体中，点是的中点．（1）求证：；（2）求证：．
7 对下列标点使用错误的解析不当的一项是 A．在很多字典里都可以找出类似见义勇为、挺身而出、刀山敢上，火海敢闯、一不怕苦，二不怕死、舍身忘死、英勇无畏等这样的词语。分号误用为顿号 B．做这项工作，你应该当仁不让!大家都知道你是专家。叹号滥用 C．你们真够可以的，也太不关心集体了。单位出了这么大的事，你们还不知道吧! 叹号滥用 D．毛毛和妈妈看完房子回来以后，高兴得又蹦又跳，嘴里不停地给爸爸描述着新房多么好!新房多么宽敞! 一逗到底
8 我国在依法治国的过程中，必须坚持做到： ①有法可依②有法必依③执法必严④违法必究 [ ] A、①② B、①③② C、①②③④ D、②③④
9 阅读理解。警方近期正在缉拿一系列案件的嫌疑人员.阅读下面有关警方通报查找人员的信息(A、B、C、D、E和F)，根据案件及人物的描述,选出嫌疑人员，选项中有一项是多余的。 1. A valuable dog was taken while being walked by its owner in City Park yesterday afternoon. Police wish to talk to a man seen nearby at the time, described by witnesses as short and fat with short light hair and clear glasses. 2. Yesterday morning at 9.30a.m. a man armed with a gun entered the National Bank and demanded money from the staff, before fleeing when confronted by bank security staff. Security cameras show the man as being short and thin with shoulder length blonde hair. 3. A tall, strong built man with blonde hair, a thick black moustache and wearing dark glasses knocked a woman to the ground and stole her purse on Main Street last Saturday afternoon. If you see this man, do not approach as he is considered extremely dangerous. 4. At the football match between Manchester United and Liverpool, several people had their wallets stolen while waiting in line to buy food. The victims did not see or notice the thief but bystanders describe him as very tall and thin, clean shaven with short light hair. 5. A car was stolen from the supermarket carpark on Friday, June 23 this year by a man described as very young, 1.7 metres tall with thin dark hair and carrying a blue backpack. A reward of $500 is offered for the car"s recovery. A Name: Ziggy Nizott Height: 1.82 m Weight: 90kg Age: 35 Details: Long history of violent crime including robbery, assault and car theft. B Name: Dennis Tsokas Height: 1.95 m Weight: 70 kg Age: 28 Details: Well known to local police having been arrested several times for pick-pocketing. C. Name: Michael Clarke Height: 1.7 m Weight: 65 kg Age: 20 Details: Arrested as a youth for car theft and the selling of stolen goods. D. Name: Mark Hughes Height: 1.6 m Weight: 60kg Age: 29 Details: Is wanted by police for several armed robbery of grocery stores, banksand post offices. E. Name: Herb Elliot Height: 1.6 m Weight: 90kg Age: 22 Details: Recently released from prison where he served 2 years for selling stolen goods F. Name: William Daniels Height: 1.6 m Weight: 90kg Age: 32 Details: Arrested 4 times for the selling of drugs and car theft.
10 Ⅰ．下列化合物在核磁共振氢谱中能出现两组峰．且其峰面积之比为3：1的有______ A．乙酸异丙酯 B．乙酸叔丁酯 C．对二甲苯 D．均三甲苯 Ⅱ．化合物A是合成天然橡胶的单体，分子式为C 5H 8．A的一系列反应如下（部分反应条件略去）：回答下列问题：（1）A的结构简式为______，化学名称是______；（2）B的分子式为______；（3）②的反应方程式为______；（4）①和③的反应类型分别是______，______；（5）C为单溴代物，分子中有两个亚甲基，④的化学方程式为______；（6）A的同分异构体中不含聚集双烯（C=C=C）结构单元的链状烃还有______种，写出其中互为立体异构体的化合物的结构简式______．

苯、乙烷、乙烯、乙炔分子中的碳碳键的键长分别为a、b、c、d，它们之间的大小顺序为（ ） A．a＞b＞c＞d B．b＞a＞c＞d C．b＞c＞d＞a D．b＞c＞a＞d

可能感兴趣的题目：

苯、乙烷、乙烯、乙炔分子中的碳碳键的键长分别为a、b、c、d，它们之间的大小顺序为（　　）

A．a＞b＞c＞d B．b＞a＞c＞d C．b＞c＞d＞a D．b＞c＞a＞d