Hydrogenation of naphthalene(P) with excess hydrogen gas stops cleanly at $1, 2, 3, 4$ -tetrahydronaphthalene (Q). What conclusion can be drawn from this experiment?

The hydrogenation of P is exothermic

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

One aromatic ring of P is more reactive than the aromatic ring of Q

No worries! We‘ve got your back. Try BYJU‘S free classes today!

One aromatic ring of P is less reactive than the other ring of Q

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Reduction of the first C

=

C of p of faster than reduction of the second or third C

=

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A The hydrogenation of P is exothermic
in this reaction, hydrogenation is taking place in the presence of palladium as a catalyst. Also, this reaction is an exothermic reaction and its $Δ H$ i,e change in enthalpy is negative. Also, hydrogenation of naphthalin with an excess of hydrogen gas stops clearly at 1, 2, 3, 4 tetrahydronaphthalenes.

Suggest Corrections

Similar questions

Q. Which of the following is an important reactive electrophilic in aromatic ring nitration?

Each of the compounds shown below has two aromatic rings, labelled as A and B. Identify the number of compounds in which ring B is more active than ring A for electrophilic aromatic substitution reaction ___

Q. Assertion :Compound (1) is formed not (11). Reason: Due to the reduction of central ring, 3 four-membered anti-aromatic rings become stable to form (1). In (2), due to the reduction of terminal ring, only one anti aromatic ring can be stabilised.

Number of compounds which are more reactive than phenol towards electrophilic aromatic substitution reaction is:

Q. Assertion :The

p K_{a}

value of (I) is lower than the

p K_{a}

value of (II). Reason: Non-aromatic compounds are more stable than anti-aromatic compounds.

Join BYJU'S Learning Program

Hydrogenation of naphthalene(P) with excess hydrogen gas stops cleanly at 1,2,3,4-tetrahydronaphthalene (Q). What conclusion can be drawn from this experiment?

Hydrogenation of naphthalene(P) with excess hydrogen gas stops cleanly at $1, 2, 3, 4$ -tetrahydronaphthalene (Q). What conclusion can be drawn from this experiment?