Q: The weight percentage of hydrogen in Q , formed in the following reaction sequence, is [Given: Atomic mass of H = 1 , C = 12 , N = 14 , O = 16 , S = 32 , Cl = 35 ]

Formula of compound = C 6 H 3 N 3 O 7 Molar Mass of compound = 12 × 6 + 3 + 14 × 3 + 16 × 7 g = 229 g Weight % of H = 3 229 × 100 = 1 . 31

Question 1

Considering LiBH _4 reduces an ester group to the corresponding alcohol and does not reduce a carboxylic acid group, the correct statement about the major products P , Q , R and S is

Accepted Answer

From the given statement, LiBH_4 selectively reduces the ester group (-CO_2Et) to an alcohol (-CH_2OH) and leaves the carboxylic acid (-CO_2H) unchanged. Borane (BH_3), on the other hand, is a well-known reagent for the chemoselective reduction of carboxylic acids to alcohols in the presence of esters. Let us analyze the first set of reactions yielding P and Q: The starting material is a 1,2-disubstituted cyclobutane derivative. At C1, the ester group (-CO_2Et) is on a wedge (up) and the acid gr

Question 2

For the reaction sequence given below, the correct statement(s) is(are)

Accepted Answer

Answer option index: 2

Question 3

An organic compound P having molecular formula C _6 H _6 O _3 gives ferric chloride test and does not have intramolecular hydrogen bond. The compound P reacts with 3 equivalents of NH _2 OH to produce

Accepted Answer

No. of - CH _3 group (methyl group) in S is 12 Alternative solution organic compound P = C _6 H _6 O _3 positive test with FeCl _3 Total number of methyl group =6+2=8 and if only main organic product is taken than number of methyl group =6 (side product is not consider)

Question 4

Reaction of iso-propylbenzene with O _2 followed by the treatment with H _3 O ^ + forms phenol and a by-product P . Reaction of P with 3 equivalents of Cl _2 gives compound Q . Treatment of Q with Ca

Accepted Answer

(1) (2) ( R ) CHCl _3 O _2 Phosgene gas COCl _2 + HCl (3) Q does not undergo Cannizaro reaction (4)

Question 5

Complete reaction of acetaldehyde with excess formaldehyde, upon heating with conc. NaOH solution, gives P and Q . Compound P does not give Tollens' test, whereas Q on acidification gives positive Tol

Accepted Answer

Total CH _2 in R =14 and oxygen in R =4 So 14+4=18

Question 6

List-I contains various reaction sequences and List-II contains the possible products. Match each entry in List-I with the appropriate entry in List-II and choose the correct option.

Accepted Answer

Answer option index: 0

Question 7

In the following reactions, P , Q , R and S are the major products. The correct statement about P , Q , R and S is

Accepted Answer

The isobutyl chloride on reaction with magnesium metal in dry ether give respective Grignard reagent. Grignard reagents produce hydrocarbon on reaction with water. Grignard reagent can react with carbon dioxide and acidic water to give respective carboxylic acid. Carboxylic acid gives carboxylate with sodium hydroxide.This salt of carboxylic acid undergo Kolbe's electrolysis to give hydrocarbon as shown below. Kolbe electrolysis : The two isobutyl radicals formed in the above reaction combin

Question 8

A trinitro compound, 1 , 3 , 5 -tris-( 4 -nitrophenyl) benzene, on complete reaction with an excess of Sn / HCl gives a major product, which on treatment with an excess of NaNO 2 / HCl at 0 &#176; C p

Accepted Answer

Nitrobenzene part converts to aniline part using  Sn / HCl . Aniline forms diazonium salt with nitrous acid and hydrogen chloride. Diazonium salt forms phenol with warm water.Phenol forms poly substituted bromo compound with bromine water. The hetero atoms present the product R &#160; are 6 bromine atoms and 3 oxygen atoms. Number of Hetero atoms in R  is 9 .

Question 9

A trinitro compound, 1 , 3 , 5 -tris-( 4 -nitrophenyl) benzene, on complete reaction with an excess of Sn / HCl gives a major product, which on treatment with an excess of NaNO 2 / HCl at 0 &#176; C p

Accepted Answer

Nitrobenzene part converts to aniline part using  Sn / HCl . Aniline forms diazonium salt with nitrous acid and hydrogen chloride. Diazonium salt forms phenol with warm water.Phenol forms poly substituted bromo compound with bromine water.   The compound P, on reaction with phenol gives coupling reaction and gives a coloured dye. Total number of carbon atoms in S are 42 and hetero atoms are 9(Nitrogen and oxygen).

Question 10

In the given reaction scheme, P is a phenyl alkyl ether, Q   is an aromatic compound; R and S are the major products. The correct statement about S is

Accepted Answer

The starting material  P  can be a phenol ether. When it reacts with hydrogen iodide, it gives phenol and alkyl iodide. The phenol formed undergo Kolbe's reaction with carbon dioxide in the presence of sodium hydroxide converts to salicylic acid. The salicylic acid gives Asprin on reaction with acetic anhydride. Aspirin belong to the class of non-narcotic analgesics.  It inhibits the synthesis of prostaglandin. Antidepressant drugs are the drugs inhibit the

Question 11

The weight percentage of hydrogen in Q , formed in the following reaction sequence, is [Given: Atomic mass of H = 1 , C = 12 , &#160; N = 14 , O = 16 , &#160; S = 32 , Cl = 35 ]

Accepted Answer

Formula of compound  = C 6 H 3 &#160; N 3 O 7 Molar Mass of compound  = 12 &#215; 6 + 3 + 14 &#215; 3 + 16 &#215; 7 g = 229 &#160; g Weight % of  H = 3 229 &#215; 100 = 1 . 31

Question 12

In the reaction given below, the total number of atoms having sp 2 hybridization in the major product P is ___.

Accepted Answer

Answer option index: 0

Alcohols Phenols and Ethers — Previous Year Questions & Solutions