问题 填空题

由C、H、O三种元素组成的有机物A,相对分子质量104。将0.1molA充

分燃烧后,将产物依次通入足量浓硫酸和氢氧化钠溶液,浓硫酸增重7.2g,氢氧化钠溶

液增重17.6g。

回答下列问题:

(1)有机物A的分子式是            

(2)A能与钠反应,也能与碳酸氢钠反应。A中含有的官能团的名称是           

(3)A与浓硫酸共热可生成一种由五个原子构成的环状化合物B。写出化学方程式

                                                                      

(4)A与浓酸共热还可以生成一种能使Br2的四氯化碳溶液褪色的化合物C。写出A生成C的化学方程式                                                     

反应类型               

利用C可以合成高分子化合物D,D的结构简式是                         

(5)A的一种同分异构体E,经测定分子结构中含有一个—CH3,两个—CH—;能与银氨溶液反应产生银镜现象。写出E与Ag(NH32OH溶液反应的化学方程式

                                                                      

答案

本题首先通过计算得到A的分子式为:C4H8O3。然后通过其性质及不饱和度的计算得知其官能团分别为:羟基、羧基。进一步依据官能团的性质即可写出反应方程式及反应类型。

多项选择题
单项选择题

Starting with his review of Skinner’s Verbal Behavior, Noam Chomsky had led the psycholinguists who argue that man has developed an innate (天生的) capacity for dealing with the linguistic universals common to all languages. Experience and learning then provide only information about the (1) instances of those universal aspects of language which are needed to communicate with other people within a particular language (2) .

This linguistic approach (3) the view that language is built upon learned associations between words. What is learned is not strings of words per se (本身), but (4) rules that enable a speaker to (5) an infinite variety of novel sentences. (6) single words are learned as concepts: they do not stand in a one-to-one (7) with the particular thing signified, but (8) all members of a general class.

This view of the innate aspect of language learning is at first not readily (9) into existing psychological frameworks and (10) a challenge that has stimulated much thought and new research directions. Chomsky argues that a precondition for language development is the existence of certain principles "intrinsic (原有的) to the mind" that provide invariant structures (11) perceiving, learning and thinking. Language (12) all of these processes; thus its study (13) our theories of knowledge in general.

Basic to this model of language is the notion that a child’s learning of language is a kind of theory (14) . It’s thought to be accomplished (15) explicit instruction, (16) of intelligence level, at an early age when he is not capable of other complex (17) or motor achievements, and with relatively little reliable data to go on. (18) , the child constructs a theory of an ideal language which has broad (19) power. Chomsky argues that all children could not develop the same basic theory (20) it not for the innate existence of properties of mental organization which limit the possible properties of languages.

15()

A.with

B.under

C.by

D.without