Hydrocarbons

The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25°C and it increases the temperature of 18.94 kg of water by 0.632°C. If the specific heat of water at 25°C is 0.998 cal/g-deg, the value of the heat of combustion of benzoic acid is

• 881.1 kcal

• 771.2 kcal

• 981.1 kcal

• 871.2 kcal

Which of the following alkenes will give same product by any method out of hydration, hydroboration-oxidation and oxymercuration-demercuration? 

• CH₃CH=CH₂

• CH₃CH=CHCH₃

• CH₃CH(CH₃)CH=CH₂

• 

The compound formed by the ozonolysis of acetylene :

• glycol

• acetic acid

• ethylene ozonide

• glyoxal

The compound which have conjugate double bond :

• butyne

• butylene

• isobutylene

• butadiene

Assertion : Staggered conformation of ethane is 12.5 kJ mol^-1 more stable than the eclipsed conformation.

Reason : The two conformations of ethane cannot be separated at room temperature.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

The C-H bond energy in ethane , ethene and ethyne :

• more in ethene

• more in ethane

• more in ethyne

• same in all these

The IUPAC name of the given compound is (CH₃)₃CCH₂C(CH₃)₃

• 2, 3,4,4-tetramethylpentane

• 1, 2, 2, 4-tetramethylpentene

• 2,2,4, 4-tetramethylpentane

• 3, 3-dimethylpentane.

What is 'A.' in the following reaction?

Assertion: Saturated hydrocarbons are chemically less reactive.

Reason : All isomeric paraffins have same parent name.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion: Chloroform is stored in dark coloured bottles.

Reason: Chronic chloroform exposure may cause damage to liver and kidneys.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.