Question 1

The gas evolved on heating  CH_3MgBr  with methanol is:

Accepted Answer

The gas evolved on heating  CH_3MgBr  in methanol is methane. \displaystyle CH_3MgBr + CH_3OH \xrightarrow {\Delta} CH_4 \uparrow + Mg(Br)OCH_3 So, the correct option is  D

Question 2

The major product of the following reaction is:

Accepted Answer

The major product of the following reaction is represented by the option (C). \displaystyle&#10; Phenolic   \displaystyle -OH  group is acidic in nature and on &#10;deprotonation gives  \displaystyle phenoxide  ion which then attacks &#10; \displaystyle methyl \: iodide . Thus net reaction is methylation of &#10;phenolic   \displaystyle -OH  group.

Question 3

Which of the following compounds will most readily be dehydrated to give alkene under acidic condition?

Accepted Answer

3-Hydroxypentan-2-one and 4-Hydroxypentan-2-one will most readily be dehydrated to give alkene under acidic condition. This will lead to formation of  \alpha - \beta  unsaturated ketone. But out of both 4-Hydroxypentan-2-one will most readily be dehydrate to give alkene under acidic condition.Note: Dehydration of 2-Hydroxycyclopentanone will lead to  C=C  double bond in 5 member ring that will cause strain and product is less likely to be formed.

Question 4

The correct statement(s) about the following reaction sequence is(are):

Cumene

(C_{9} H_{12}) i) O_{2} i i) H_{3} O^{+} P C H C l_{3} / N a O H Q (m a j o r) + R (m i n o r) Q N a O H P h C H_{2} B r S

Accepted Answer

Q is steam volatile not R. Q & R show positive test with 1% aqueous  FeCl_3  Solution. (Test for phenol)Q, R, S show positive 2,4-dinitrophenyl hydrazine. (Test for carbonyl group)

Question 5

An organic compound  (C_8 H_{10} O_2)  rotates plane-polarized light. It produces pink color with neutral  FeCl_3  solution. What is the total number of all the possible isomers for this compound?

Accepted Answer

Since compound  C_8 H_{10} O_2  corresponds positively to neutral  FeCl_3 . Hence it will be a phenol compound. Hence total optically active isomers will be  6 .

Question 6

LIST-I contains&#10;reactions and LIST-II contains major products.&#10;Match each reaction in LIST-I with one or more product in&#10;LIST-II and choose the correct option.

Accepted Answer

Hence, option  B  is correct.

Question 7

For the given compound  X , the total number of optically active stereoisomers is __________.

Accepted Answer

Hence answer is 7.

Alcohols, Phenols And Ethers