Identity the product in the following sequence :$3,4,5 Tri Bromo Aniline \xrightarrow[{(ii) H_3 PO_2 }]{ {(i) Diazotisation} }$
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Amines MCQs for NEET — Chemistry Questions with Answers
Practice free Amines (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Aromatic nitriles (ArCN) are not prepared by the reaction :
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Explanation
Aromatic nitriles (ArCN) are not prepared by the reaction of ArX with KCN. This is because KCN is not efficient enough to substitute the halide group (X) in aromatic halides. The other options involve reactions that can effectively produce aromatic nitriles.
Presence of a nitro group in a benzene ring _ _
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Explanation
The presence of a nitro group (-NO2) on a benzene ring deactivates the ring towards electrophilic substitution. This is because the nitro group is an electron-withdrawing group due to its strong -I (inductive effect) and -M (mesomeric effect), which reduces the electron density on the benzene ring, making it less reactive towards electrophiles.
Which of the following reactions is known as "Balz -Schiemann reaction"?
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Explanation
The Balz-Schiemann reaction involves the conversion of an aryl amine to an aryl fluoride via a diazonium salt intermediate. The reaction is represented as follows: $C_6H_5N_2Cl^- + HBF_4 ightarrow C_6H_5N_2^+BF_4^- ightarrow[ riangle] C_6H_5F$. This reaction is useful for introducing a fluorine atom into an aromatic ring.
Which has highest Kb value? $ R = CH_3 $
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Identify (D) in the given reaction.$CH_3 COOH \xrightarrow[{(ii) PBr_3}]{ {(i) LiAlH_4} } [A] \xrightarrow [ {(ii) LiAlH_4} ] {{ (i) KCN } } [B] \xrightarrow { { CHCl_3 / OH^- } } [C] \xrightarrow { { LiAlH_4 } }$
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What will be the final product "Z" of the following reaction ? $ CH_3 CH_2COOH \xrightarrow [{(ii) \triangle } ] { { (i) NH_3 }} X \xrightarrow [ { (ii) HNO_3} ] { { (i) Br_2 / KOH } } Y \xrightarrow [] { { KMnO_4 / H_2 SO_4 } } Z $
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Which of the following has the highest dipole moment
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Explanation
Dipole moment is influenced by the difference in electronegativity between atoms and the molecular geometry. $ NH_3 $ (ammonia) has the highest dipole moment among the given hydrides because nitrogen is more electronegative than phosphorus, antimony, and arsenic, resulting in a larger separation of charge.
Which of the following is not hydrolysed
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Explanation
Due to absence of d - orbital in N - atom, it can't accept e– from $ H_2O for hydrolysis of NF_3 $
Which of the following has highest B.P
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Explanation
$ NH_3 PH_3 AsH_3 SbH_3 $ BP \rightarrow 238.5 185.5 210.6 254.6
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