NEET BOOSTER | NEET 2020 PREPARATION | NEET EXAM | NTA … · 2020. 8. 20. · Which of the...

Select the alkane which forms four isomeric dihalo derivatives

(A) Isobutane

(B) Propane

(C) Neopentane

(D) Ethane.

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Which of the following hydrocarbon with formula C8H18 gives

one monochloro derivatives

(A) n-Octane

(B) 3-Methyl heptane

(C) 2, 2, 4 - Trimethyl butane

(D) 2, 2, 3, 3 - Tetramethyl butane

Which of the following statement is correct

(A) Decreasing order of density of alkyl halides is RI > RBr >

RCI > RF

(B) The stability order of alkyl halides is RF > RCl > RBr >RI

(C) Among isomeric alkyl halides the decrease in boiling point

1º > 2º > 3º

(D) All are correct.

Which statement is not correct

(A) Polyhalides are lighter than water

(B) Halo alkanes have higher boiling points as compared to

those of corresponding alkanes

(C) Halides are soluble in organic solvents

(D) None of the above.

An alkyl halide is insoluble in water because

(A) Alkyl halide is non polar and H2O is polar

(B) Both are polar

(C) Alkyl halide does not form hydrogen bond with water

(D) Alkyl halide has halogen atom in it.

The correct order of polarity of alkyl halides is

(A) RI > RBr < RCl > RF

(B) RF > RCl > RBr > RI

(C) RCl > RF > RBr > RI

(D) None of these.

Which chloride is the most reactive towards aqueous NaOH in

(A) Methyl chloride

(B) Isopropyl chloride

(C) Vinyl chloride

(D) Benzyl chloride.

The SN2 reactivity order for halides

(A) R - F > R - Cl > R - Br > R - I

(B) R - I > R - Br > R - Cl > R - F

(C) R - Br > R - l > R - Cl > R - F

(D) R - Cl > R - Br > R - F > R - I

In SN1 reaction, the first step involves the formation of

(A) Free radical

(B) Carbanion

(C) Carbocation

(D) Final product.

The rate law for the reaction, RCl + NaOHaq.) ROH + NaCl is

given by, rate = K1 [RCl]. The rate of the reaction will be

(A) Doubled on doubling the concentration of sodium hydroxide

(B) Halved on reducing the concentration of alkyl halide to half

(C) Decreased on increasing the temperature of the reaction

(D) Unaffected by increasing the temperature of the reaction

C2H5Cl + AgF C2H5F + AgCl

The above reaction is called

(A) Hunsdiecker

(B) Swart

(C) Strecker

(D) Wurtz.

The general molecular formula of dihaloalkanes is

(A) CnH2n+1X

(B) CnH2n+2X2

(C) CnH2nX2

(D) CnH2n–2X2.

A vicinal dihalide is not formed in the reaction

(A) HOCH2–CH2OH

(B) CH3–CH = CH2

(C) CHCH

(D) CH3–CH=CHBr

Peroxide

A gem dichloride is formed in the reaction except

(A) CH3CHO and PCl5

(B) CH3COCH3 and PCl5

(C) CH2=CH2 and Cl2

(D) CH2=CHCl and HCl.

2,2–dichloropropane on hydrolysis yields

(A) Acetone

(B) 2,2-Propane diol

(C) Isopropyl alcohol

(D) Acetaldehyde.

Propylidene chloride when heated with zinc gives

(A) Ethene

(B) Propene

(C) 1-Butene

(D) 3-Hexene.

Ethylene amine is the substitution product of

(A) Ethylene chloride

(B) Gem dihalide

(C) Both of these

(D) None of these.

CHCl3 is kept in brown bottles well stoppered and also with

1% alcohol so that it may not form

(A) CH2Cl2

(B) COCl2

(C) CCl4

(D) None of these.

Chloroform can be obtained from

(A) Methanol

(B) Methanal

(C) 1-Propanol

(D) 2-Propanol.

Which of the following statement is wrong

(A) All carbonyl compounds of the general structure give a

positive iodoform test

(B) All secondary alcohols give iodoform reaction

(C) Alkanols of the structure CH3CH(OH)–R (where R=H,

alkyl or aryl) give iodoform reaction

(D) The only aldehyde giving iodoform reaction is acetaldehyde.

CH3–C–R

In the reaction

RCOOAg + Br2 RBr + CO2 + AgBr

the intermediate formed is

(A) R–COOBr

(B) RCOO•

(C) R•

(D) All of these.

Consider the following reaction sequence.

CH3CCH A B

The product (A) and (B) are, respectively

(A) CH3COCH3 and CH3CCl2CH3

(B) CH3CH2CHO and CH3CH2CHCl2

(C) CH3CHOHCH3 and CH3CHClCH3

(D) Both (A) and (C).

SOH.aq

Neopentyl bromide is allowed to react with sodium ethoxide in

ethanol. The major substitution product formed in the reaction is

(A) (B)

(C) (D)

CH3–C–CH2–OC2H5

CH3–CH–CHCH3

CH3CH2–C–OC2H5

CH3–CH–CH2–CH2–OC2H5

Which of the following reactions will not give an isocyanide

(A) CH3CH2Br + AgCN

(B) CH3CH2NH2 + CHCl3 + KOH

(C) CH3CH2CONH2 + P2O5

(D) All of the above.

Which of the following processes does not occur during the

formation of CHCl3 from C2H5OH and bleaching powder

(A) Oxidation

(B) Chlorination

(C) Hydrolysis

(D) Reduction.

Which of the following reactions is not expected to give a

satisfactory yield of alkyl iodide

(A) CH3CH2OH + KI + H3PO4

(B) CH3CH2OH + PI3

(C) CH3CH2Br + NaI

(D) CH3CH2COOAg + I2

acetone

2-Bromopentane is heated with potassium ethoxide in ethanol.

The major product is

(A) trans-2-pentene

(B) 2-ethoxypentane

(C) 1-pentene

(D) cis-2-pentene.

Consider the following sequence of reactions.

C2H5Cl X Y

The products (X) and (Y) are, respectively

(A) C2H5CN and C2H5CH2NH2

(B) C2H5CN and C2H5CONH2

(C) C2H5NC and C2H5NHCH3

(D) C2H5CN and C2H5COOH.

The order of decreasing SN1 reactivities of the halides is

CH3CH2CH2Cl CH2 = CHCHClCH3

CH3CH2CHClCH3

(A) I > II > III (B) II > I > III

(C) II > III > I (D) III > II > I.

In the preparation of ethyl chloride by the reaction

CH3CH2OH+HCl CH3CH2Cl + H2O

the major reason for using anhydrous ZnCl2 as a catalyst is that

(A) It absorbs water formed in the reaction and drives the equilibrium to theright

(B) It coordinates with the product CH3CH2Cl and drives the reaction to theright

(C) It assists in forming the nucleophile Cl– from HCl

(D) It coordinates with oxygen of ethyl alcohol and increases the leavinggroup ability of the –OH group.

anhydrous

NEET BOOSTER | NEET 2020 PREPARATION | NEET EXAM | NTA … · 2020. 8. 20. · Which of the...

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