Chất X có công thức phân tử C₄H₈O₂  khi tác dụng với dung dịch NaOH sinh ra chất Y có công thức C₃H₅O₂Na . X thuộc loại chất nào sau đây? 

A. Axit 

B. Este 

C. Andehit 

D. Ancol 

many things in new school are different

chúc bạn học tốt môn tiếng anh

1) awake

2)regularly

3)cureless

4)assignments

5)application

chúc bạn học tốt môn tiếng anh (-_-)

câu hỏi Where did you go yesterday

câu trả lời Iwent to the book shop

I like volleyball

because it is a good sport for good health

me too

kb vs mình đi

35100

cách 1 tính gộp

cách 2 tính lẻ

I very useful and self-employed on your family.

My little family is always filled with the father's laughter, warm mother's voice and brother's hyperactivity. Partition of Outlet Outlet Outlet, for this will in a military team. Perhaps because of the years of competition and training, I should become more serious and serious but also very funny and witty. Looking at the mirror, the layout is tough but alive very emotionally. The restriction cylinders in the family. B not only the point of the spirit for the mother but also all with the sisters. Different from father, mother is weak, tender and surety. As free Vietnamese women still exist, mother is difficult, sacrificed without a word. Mother always take care of family is happiness. With you we can, mother medium is a friend you will be a macro the person. My parents are idols in my heart. Fun, the most hyperactive house is none other than six-year-old brother. This year, it will enter first grade. Looking at your face prepares you for the new school year, as I did the year before, and so was the bright part. However with exception and very smart. Two sisters I can play together all day long not bored. If you have a day that is not enough of the voice of em, I can not say as free, which I will remember im ...

My small family happy happy. There will also be times when it's hard or the problem of my family will still remain because everyone in the world has a loving, trusting heart.

1. my class / go camping / next week / .
>> My class is going to go camping next week
2. Jane / can / play / the guitar / the violin / .
>> Jane can play both the guitar and the violin
3. I / like / travel /and / Mary / .
>> I like traveling and so does Mary
4. I / would like / go / the cinema / tonight / .
>> I would like to go to the cinema tonight
5. Jack / Tom / not go / school / yesterday / .
>> Jack and Tom did not go to school yesterday

6. you / can / ask / the teacher / that question / ?
>> Do you ask the teacher about that question
7. Sally / look / very happy / her new dress /
>> Sally looks very happy because of her new dress
8. we / must / go / the bank / change / some money / .
>> We must go to the bank to change some money
9. she / make / so many / mistakes / her writing / .
>> She makes so many mistake in her writting
10. he / never / smoke / bed / .

>> he never smoke on the bed