NEET Chemistry Questions Solved


IUPAC name of the compound,  is:

(a) 1,2,3-tricyanopropane

(b) propane-1,2,3-tricarbonitrile

(c) 1,2,3-cyanopropane

(d) propane tricarbylamine

(b) Follow IUPAC rules.

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The IUPAC name of the compound

 

(1) 3,3-diethyl-4-methyl-5-isopropyloctane

(2) 3,3-diethyl-5-isopropyl-4-methyloctane

(3) 4-isopropyl-5-methyl-6,6-diethyloctane

(4) 6,6-diethyl-4-isopropyl-5-methyloctane

(2)

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The correct structure of 3,3dimethylbutyne is:

(a) CH3CH2-CC-CH2CH3

(b) (CH3)3C-CCH

(c) CH3-CCCH(CH3)2

(d) 

(b)  is 3,3-dimethyl butyne.

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The IUPAC name of the compound

(1) 3,3-diethyl-4-methyl-5-isporopyloctane

(2) 3,3-diethyl-5-isopropyl-4-methyloctane

(3) 4-isopropyl-5-methyl-6,6-diethyloctane

(4) 6,6-diethyl-4-isopropyl-5-methyloctane 

(2)

 

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The IUPAC name of the compound, 

 is:

(a) 2-ethylbutanamide

(b)2-methylbutanamide

(c) 1-amino-2-methylpropane

(d) none of the above

(b) Follow IUPAC rules.

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 The compound is an example:

(a) aromatic compound                 (b) heterocyclic compound

(c) annulene                                 (d) xanthates

(c) This is annulene.

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Which of the following species is paramagnetic?

(a) A carbocation                     (b) A free radical

(c) A carbanion   ion                (d) All of these

(b) Free radical has unpaired electron.

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The IUPAC name of the compound CH3CONH(Br) is:

(a) 1-bromoacetamide            (b) N-bromoethanamide

(c) ethanoyl bromide              (d) none of these

(b) 

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The compound obtained by heating a mixture of primary amine and chloroform with ethanolic potassium hydroxide (KOH) is                                                                          

(a) an alkyl isocyanide

(b) an alkyl halide

(c) an amide

(d) an amide and nitro compound

(a) RNH2 + CHCl3 + 3KOH(alc.) RNC + 3KCl +3H2O

                                             Alkyl isocyanide

This reaction is known as known as carbylamine test. (only 1° amine gives this reaction)

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A reagent suitable for the determinatin of N-terminal residue of a peptide is 

(a) p-toluene sulphonyl chloride

(b) 2,4-dinitrophenyl hydrazine

(c) carboxypeptidase

(d) 2,4-dinitro fluorobenzene

(d) 2,4-dinitro fluorobenzene is called Sanger's reagent. When this reagent reacts with amino group of peptide chain, it form 2,4-dinitrophenyl derivatives which on hydrolysis form DNP derivatives of amino acids.

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