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NEET Chemistry Solved Question Paper 2006

Multiple Choice Questions

51.

Nitrobenzene on treatment with zinc dust and aqueous ammonium chloride gives

C₆H₅N =N-C₆H₅
C₆H₅NH₂
C₆H₅NO
C6H₅NHOH.

52.

Thymine is

5-methyluracil
4-methyluracil
3-methyluracil
1-methyluracil

53.

Lysine is least soluble in water in the pH range

3 to 4
5 to 6
6 to 7
8 to 9.

54.

Methyl- $α - D$ -glucoside and methyl- $β$ -D-glucoside are

epimers
anomers
enantiomers
conformational diastereomers.

55.

Which ofthe following compounds has the highest boiling point?

CH₃CH₂CH₂Cl
CH₃CH₂CH₂CH₂Cl
CH₃CH(CH₃)CH₂Cl
(CH₃)₃CCl

56.

The correct increasing order of the reactivity of halides for S_N1 reaction is

CH₃- CH₂- X<(CH₃)₂CH= X <CH₂= CH-CH₂- X< PhCH₂- X
(CH₃)₂CH-X <CH₃-CH₂- X < CH₂= CH - CH₂-X < PhCH₂-X
PhCH₂- X<(CH₃)₂CH=X<CH₃-CH₂-X<CH₂= CH- CH₂- X
CH₂= CH - CH₂- X < Ph- CH₂- X <(CH₃)₂CH-X <CH₃-CH₂- X

57.

The major product formed in the following reaction is

${CH}_{2} CH (Cl) {CH}_{2} - {CH}_{2} OH \overset{aq . KOH}{\to}$

CH₃CH = CH- CH₂OH
CH₂=CH- CH₂- CH₂OH
${CH}_{3} - \underset{OH}{\underset{|}{CH}} - {CH}_{2} - {CH}_{2} OH$

58.

Assertion : In the iodometric titration starch is used as an indicator.

Reason : Starch is a polysaccharide.

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

59.
Assertion: Anilinium chloride is more acidic than ammonium chloride.
Reason : Anilinium ion is resonance-stabilised.

If both assertion and reason are true and reason is the correct explanation of the assertion.

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

If assertion is true, but reason is false.

Both assertion and reason are false statements.

If assertion is true, but reason is false.

Both assertion and reason are false statements.

$\underset{\underset{stronger acid}{anilinum ion}}{C_{6} H_{5} \overset{+}{N} H_{3}} \to \underset{\underset{weaker conjugated base}{(aniline)}}{C_{6} H_{5} {NH}_{2}} + H^{+}$

Aniline is weaker base than ammonium chloride. In NH₄Cl or aliphatic amines. the non-bonding electron pair of N is localized and is fully available for coordination with a proton. On the other hand, in aniline or other aromatic amines, the non-bonding electron pair is delocalisecl into benzene ring by
resonance.

But anilinium ion is less resonance stabilised than aniline.

60.

Assertion : 1,3-butadiene is the monomer for natural rubber.

Reason : Natural rubber is formed through anionic addition polymerization.

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