List of practice Questions

Consider the following ANSI C program: 

int main() { 
    Integer x; 
    return 0; 
}

Which one of the following phases in a seven-phase C compiler will throw an error?

The transformation occurring in Duma's method is given below:
$\text{C}_2 \text{H}_7 \text{N} + (2x + y/2) \text{CuO} \to x \text{CO}_2 + y/2 \text{H}_2\text{O} + z/2 \text{N}_2 + (2x + y/2) \text{Cu}$.
The value of $y$ is ________. (Integer answer)
The correct sequence of reagents used in the preparation of 4-bromo-2-nitroethylbenzene from benzene is:

The correct order of acid character of the following compounds is : 
I: Phenol, II: p-Nitrobenzoic acid, III: Benzoic acid, IV: p-Toluic acid 

The number of compound/s given below which contain/s —COOH group is ________ . (Integer answer)
(A) Sulphanilic acid (B) Picric acid (C) Aspirin (D) Ascorbic acid
Staggered and eclipsed conformers of ethane are :

The correct order of stability of given carbocations is : 

Presence of which reagent will affect the reversibility of the following reaction, and change it to a irreversible reaction:
$CH_4 + I_2 \rightleftharpoons CH_3-I + HI$

Which one of the following compounds will give orange precipitate when treated with 2,4-dinitrophenyl hydrazine ? 

Consider the above reaction and identify the Product P : 

Given below are two statements:
Statement I : Aniline is less basic than acetamide.
Statement II : In aniline, the lone pair of electrons on nitrogen atom is delocalised over benzene ring due to resonance and hence less available to a proton.
Choose the most appropriate option :
An organic compound is subjected to chlorination to get compound A using 5.0 g of chlorine. When 0.5 g of compound A is reacted with AgNO$_3$ [Carius Method], the percentage of chlorine in compound A is _________ when it forms 0.3849 g of AgCl. (Round off to the Nearest Integer)
(Atomic masses of Ag and Cl are 107.87 and 35.5 respectively)
Which one of the following reactions will not form acetaldehyde ?
Consider the reaction: CH$\equiv$CH $\xrightarrow{\text{Red hot Fe}}$ (1) $\xrightarrow{CO, HCl, AlCl_3}$ (2). The number of sp$^2$ hybridized carbon atom(s) in the product is __________.

Which of the following compound gives pink colour on reaction with phthalic anhydride in conc. \( \mathrm{H_2SO_4} \) followed by treatment with \( \mathrm{NaOH} \) ? 

What is the final product (major) 'A' in the given reaction ? $CH_3 - CH = CH - CH_3 \xrightarrow{HCl} A$ 

In the following molecule,

Hybridisation of Carbon a, b and c respectively are :

Which one of the following set of elements can be detected using sodium fusion extract ?
Given below are two statements :
Statement I : Hyperconjugation is a permanent effect.
Statement II : Hyperconjugation in ethyl cation \( (\mathrm{CH_3-CH_2^+}) \) involves the overlapping of \( \mathrm{C_{sp^2}-H_{1s}} \) bond with empty \( 2p \) orbital of the other carbon.
Choose the correct option :

Consider the above reaction, the major product "P" formed is : 

 

The correct sequence of correct reagents for the following transformation is : 

 

Which one among the following resonating structures is not correct ? 

Match List - I with List - II : List - I
(a) Chlorophyll
(b) Vitamin - B₁₂
(c) Anticancer drug
(d) Grubbs catalyst List - II
(i) Ruthenium
(ii) Platinum
(iii) Cobalt
(iv) Magnesium

The correct structures of trans-[NiBr₂(PPh₃)₂] and meridional-[Co(NH₃)₃(NO₂)₃], respectively, are : 

Compound with molecular formula C₃H₆O can show :