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NEET Chemistry Solved Question Paper 2010

Multiple Choice Questions

51.

The chemical name for melamine is

1,3,5-Triamino-2,4,6-triazine
2,4,6-Triamino-1,3,5-triazine
2-Amino-1,3,5-triazine
2,4-Diamino-1,3,5-triazine

52.

Bromine is added to cold dilute aqueous solution ofNaOH. The mixture is boiled. Which of the following statements is not true?

During the reaction bromine is present in four different oxidation states.
The greatest difference between the various oxidation states of bromine is 5.
On acidification ofthe final mixture bromine is formed.
Disproportionation of bromine occurs during the reaction.

53.

Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E. Compound Eon further treatment with aqueous KOH yields compound F. Compound F is

54.

Ethyl ester $\to_{excess}^{{CH}_{3} MgBr} P$ . The product p will be

55.

The compound which on reaction with aqueous nitrous acid at low temperature produces an oily nitrosoamine is

methyl amine
ethyl amine
diethyl amine
triethyl amine

56.
Compound A (molecular formula C₃H₈O) is treated with acidified potassium dichromate to form a product B (molecular formula C₃H₆O). B forms a shining silver mirror on warming with ammoniacal silver nitrate. B when treated with an aqueous solution of H₂NCONHNH₂. HCl and sodium acetate gives a product C. Identify the structure of C.

CH₃CH₂CH=NNHCONH₂

CH₃-C(CH₃)=NNHCONH₂

CH₃-C(CH₃)=NCONHNH₂

CH₃CH₂CH=NCONHNH₂

CH₃CH₂CH=NNHCONH₂

A is an alchohol and its oxidation product gives Tollen's test.Tollen's reagents is a chemical reagents used to determine the presence of aldehyde, aromatic aldehyde, and alpha-hydroxyl ketone functional group. The reagent consists of a solution of sliver nitrate, ammonia and some sodium hydroxide.

$\underset{A}{C_{3} H_{8} O}$ $\overset{K_{2} {Cr}_{2} O_{7} / H^{+}}{\to}$ $\underset{B}{C_{3} H_{6} O}$ $\overset{amm . {AgNO}_{3}}{\to} Silver mirror$

Reaction of B indicates that B is an aldehyde thus B should be C₂H₅CHO or CH₃CH₂CHO and therefore C should be CH₃CH₂CH=NNHCONH_2.

$\underset{[A]}{{CH}_{3} {CH}_{2} {CH}_{2} OH}$ $\overset{[O]}{\to}$ $\underset{[B]}{{CH}_{3} {CH}_{2} CHO}$ $\overset{Silver mirror test}{\to} {CH}_{3} {CH}_{2} COOH + 2 Ag ↓$

${CH}_{3} {CH}_{2} {CH}_{2} OH + \underset{semicarbazide}{H_{2} {NNHCONH}_{2}}$ $\to \underset{semicarbazone [C]}{{CH}_{3} {CH}_{2} CH = {NNHCONH}_{2}}$

57.

The major product of the following reaction is

58.

Asssertion: CH₃-C(COOC₂H₅)=CH-COOH is 3-carbethoxy-2-butenoic acid.

Reason : Principal functional group gets lowest number followed by double bond or triple bond.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

59.

Assertion : Aldol condensation can be catalysed both by acids and bases.

Reason : $β$ -Hydroxy aldehydes or ketones readily undergo acid catalysed dehydration.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

60.

Assertion : Benzene on heating with cone. H₂SO₄ gives benzenesulphonic acid which when heated with superheated steam under pressure gives benzene.

Reason : Sulphonation is a reversible process.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.