NEET

These are Assertion-Reason type questions. Each of these question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these questions from the following four options.

Statement-1 : CCl₄ is not a fire extinguisher.

Statement-2 :CCl₄ is insoluble in water.

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1
Statement-1 is True, Statement-2 is True ; Statement-2 is NOT a correct explanation for Statement-1
Statement-1 is True, Statement-2 is False
Statement-1 is False, Statement-2 is True

Solution

CCl₄ is used as a fire extinguisher. The dense, noncombustible vapours cover the burning substance and prevents the availability of oxygen around burning material

n-Propyl bromide on treatment with ethanolic potassium hydroxide produces

propane
propene
propyne
propanol

Solution

Identify the set of reagents ‘X’and ‘Y’ in the following set of transformations

X= dilute aqueous NaOH, 20°C; Y = HBr/acetic acid,20°C
X = concentrated alcoholic NaOH,80°C; Y = HBr/aceticacid, 20°C
X = diluteaqueous NaOH, 20°C; Y = Br₂/CHCl₃, 0°C
X= concentrated alcoholic NaOH, 80°C; Y = Br₂/CHCl₃,0°C

Solution

(CH₃)₃CMgCl on reaction with D₂O produces :

(CH₃)₃CD
(CH₃)₃OD
(CD₃)₃CD
(CD₃)₃OD

Solution

(CH₃)₃C - MgCl + D₂O → (CH₃)₃C - D + Mg(OD)Cl

he best method for the conversion of an alcohol into an alkyl chloride is by treating the alcohol with

PCl₅
dry HCl in the presence of anhydrous ZnCl₂
SOCl₂ in presence of pyridine
None of these

Solution

The reaction conditions leading to the best yields of C₂H₅Cl are :

A
B
C
D

Solution

Ethanol can be prepared more easily by which reaction ?

(i) CH₃CH₂Br + H₂O → CH₃CH₂OH

(ii) CH₃CH₂Br + Ag₂O (in boiling water) → CH₃CH₂OH

by (i) reaction
by (ii) reaction
Both reactions proceed at same rate
by none

Solution

In the following sequence of reactions

\(C_{2} H_{5} Br \overset{AgCN}{\rightarrow} X \overset{Reduction}{\rightarrow} Y ; Y\) is

n-propyl amine
isopropylamine
ethylamine
ethylmethyl amine

Solution

Chlorobenzene gives aniline with :

NH₃ + Cu₂O
NH₃ + H₂SO₄
NaNH₂
None of these

Solution

When two halogens are attached to same carbon atom, it is known as :

vic-dihalide
gem-dihalide
α,ω-dihalide
α,β-dihalide

Solution

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